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Classical liberalism

Classical liberalism is a political tradition and a branch of liberalism that advocates free market and laissez-faire economics and civil liberties under the rule of law, with special emphasis on individual autonomy, limited government, economic freedom, political freedom and freedom of speech. Classical liberalism, contrary to liberal branches like social liberalism, looks more negatively on social policies, taxation and the state involvement in the lives of individuals, and it advocates deregulation.

Until the Great Depression and the rise of social liberalism, classical liberalism was called economic liberalism. Later, the term was applied as a retronym, to distinguish earlier 19th-century liberalism from social liberalism. By modern standards, in the United States, simple liberalism often means social liberalism, but in Europe and Australia, simple liberalism often means classical liberalism.

Classical liberalism gained full flowering in the early 18th century, building on ideas dating at least as far back as the 16th century, within the Iberian, British, and Central European contexts, and it was foundational to the American Revolution and "American Project" more broadly. Notable liberal individuals whose ideas contributed to classical liberalism include John Locke, Jean-Baptiste Say, Thomas Malthus, and David Ricardo. It drew on classical economics, especially the economic ideas as espoused by Adam Smith in Book One of The Wealth of Nations, and on a belief in natural law, social progress, and utilitarianism. In contemporary times, Friedrich Hayek, Milton Friedman, Ludwig von Mises, Thomas Sowell, George Stigler, Larry Arnhart, Ronald Coase and James M. Buchanan are seen as the most prominent advocates of classical liberalism. However, other scholars have made reference to these contemporary thoughts as neoclassical liberalism, distinguishing them from 18th-century classical liberalism.

In the context of American politics, "classical liberalism" may be described as "fiscally conservative" and "socially liberal". Despite this, classical liberals tend to reject the right's higher tolerance for economic protectionism and the left's inclination for collective group rights due to classical liberalism's central principle of individualism. Additionally, in the United States, classical liberalism is considered closely tied to, or synonymous with, American libertarianism.

Evolution of core beliefs
Core beliefs of classical liberals included new ideas – which departed from both the older conservative idea of society as a family and from the later sociological concept of society as a complex set of social networks.

Classical liberals agreed with Thomas Hobbes that individuals created government to protect themselves from each other and to minimize conflict between individuals that would otherwise arise in a state of nature. These beliefs were complemented by a belief that financial incentive could best motivate labourers. This belief led to the passage of the Poor Law Amendment Act 1834, which limited the provision of social assistance, based on the idea that markets are the mechanism that most efficiently leads to wealth.

Drawing on ideas of Adam Smith, classical liberals believed that it was in the common interest that all individuals be able to secure their own economic self-interest. They were critical of what would come to be the idea of the welfare state as interfering in a free market. Despite Smith's resolute recognition of the importance and value of labour and of labourers, classical liberals criticized labour's group rights being pursued at the expense of individual rights while accepting corporations' rights, which led to inequality of bargaining power. Classical liberals argued that individuals should be free to obtain work from the highest-paying employers, while the profit motive would ensure that products that people desired were produced at prices they would pay. In a free market, both labour and capital would receive the greatest possible reward, while production would be organized efficiently to meet consumer demand. Classical liberals argued for what they called a minimal state and government, limited to the following functions:
 * Laws to protect citizens from wrongs committed against them by other citizens, which included protection of individual rights, private property, enforcement of contracts and common law.
 * A common national defence to provide protection against foreign invaders.
 * Public works and services that cannot be provided in a free market such as a stable currency, standard weights and measures and building and upkeep of roads, canals, harbours, railways, communications and postal services.

Classical liberals asserted that rights are of a negative nature and therefore stipulate that other individuals and governments are to refrain from interfering with the free market, opposing social liberals who assert that individuals have positive rights, such as the right to vote, the right to an education, the right to health care, and the right to a minimum wage. For society to guarantee positive rights, it requires taxation over and above the minimum needed to enforce negative rights.

Core beliefs of classical liberals did not necessarily include democracy nor government by a majority vote by citizens because "there is nothing in the bare idea of majority rule to show that majorities will always respect the rights of property or maintain rule of law". For example, James Madison argued for a constitutional republic with protections for individual liberty over a pure democracy, reasoning that in a pure democracy a "common passion or interest will, in almost every case, be felt by a majority of the whole ... and there is nothing to check the inducements to sacrifice the weaker party".

In the late 19th century, classical liberalism developed into neoclassical liberalism, which argued for government to be as small as possible to allow the exercise of individual freedom. In its most extreme form, neoclassical liberalism advocated social Darwinism. Right-libertarianism is a modern form of neoclassical liberalism. However, Edwin Van de Haar states although classical liberal thought influenced libertarianism, there are significant differences between them. Classical liberalism refuses to give priority to liberty over order and therefore does not exhibit the hostility to the state which is the defining feature of libertarianism. As such, right-libertarians believe classical liberals do not have enough respect for individual property rights and lack sufficient trust in the free market's workings and spontaneous order leading to their support of a much larger state. Right-libertarians also disagree with classical liberals as being too supportive of central banks and monetarist policies.

Typology of beliefs
Friedrich Hayek identified two different traditions within classical liberalism, namely the British tradition and the French tradition:
 * The British philosophers Bernard Mandeville, David Hume, Edmund Burke, Adam Smith, Adam Ferguson, Josiah Tucker and William Paley held beliefs in empiricism, the common law and in traditions and institutions which had spontaneously evolved but were imperfectly understood.
 * The French philosophers Voltaire, Jean-Jacques Rousseau, Denis Diderot, Maximilien Robespierre, Marquis de Condorcet, the Encyclopedists and the Physiocrats believed in rationalism and sometimes showed hostility to tradition and religion.

Hayek conceded that the national labels did not exactly correspond to those belonging to each tradition since he saw the Frenchmen Montesquieu, Benjamin Constant, Joseph De Maistre and Alexis de Tocqueville as belonging to the British tradition and the British Thomas Hobbes, Joseph Priestley, Richard Price, Edward Gibbon, Benjamin Franklin, Thomas Jefferson and Thomas Paine as belonging to the French tradition. Hayek also rejected the label laissez-faire as originating from the French tradition and alien to the beliefs of Hume and Smith.

Guido De Ruggiero also identified differences between "Montesquieu and Rousseau, the English and the democratic types of liberalism" and argued that there was a "profound contrast between the two Liberal systems". He claimed that the spirit of "authentic English Liberalism" had "built up its work piece by piece without ever destroying what had once been built, but basing upon it every new departure". This liberalism had "insensibly adapted ancient institutions to modern needs" and "instinctively recoiled from all abstract proclamations of principles and rights". Ruggiero claimed that this liberalism was challenged by what he called the "new Liberalism of France" that was characterised by egalitarianism and a "rationalistic consciousness".

In 1848, Francis Lieber distinguished between what he called "Anglican and Gallican Liberty". Lieber asserted that "independence in the highest degree, compatible with safety and broad national guarantees of liberty, is the great aim of Anglican liberty, and self-reliance is the chief source from which it draws its strength". On the other hand, Gallican liberty "is sought in government ... . [T]he French look for the highest degree of political civilisation in organisation, that is, in the highest degree of interference by public power".

Great Britain
French physiocracy heavily influenced British classical liberalism, which traces its roots to the Whigs and Radicals. Whiggery had become a dominant ideology following the Glorious Revolution of 1688 and was associated with supporting the British Parliament, upholding the rule of law, defending landed property and sometimes included freedom of the press and freedom of speech. The origins of rights were seen as being in an ancient constitution existing from time immemorial. Custom rather than as natural rights justified these rights. Whigs believed that executive power had to be constrained. While they supported limited suffrage, they saw voting as a privilege rather than as a right. However, there was no consistency in Whig ideology and diverse writers including John Locke, David Hume, Adam Smith and Edmund Burke were all influential among Whigs, although none of them were universally accepted.

From the 1790s to the 1820s, British radicals concentrated on parliamentary and electoral reform, emphasising natural rights and popular sovereignty. Richard Price and Joseph Priestley adapted the language of Locke to the ideology of radicalism. The radicals saw parliamentary reform as a first step toward dealing with their many grievances, including the treatment of Protestant Dissenters, the slave trade, high prices, and high taxes. There was greater unity among classical liberals than there had been among Whigs. Classical liberals were committed to individualism, liberty, and equal rights, as well as some other important tenants of leftism, since classical liberalism was introduced in the late 18th century as a leftist movement. They believed these goals required a free economy with minimal government interference. Some elements of Whiggery were uncomfortable with the commercial nature of classical liberalism. These elements became associated with conservatism.

Classical liberalism was the dominant political theory in Britain from the early 19th century until the First World War. Its notable victories were the Roman Catholic Relief Act 1829, the Reform Act of 1832 and the repeal of the Corn Laws in 1846. The Anti-Corn Law League brought together a coalition of liberal and radical groups in support of free trade under the leadership of Richard Cobden and John Bright, who opposed aristocratic privilege, militarism, and public expenditure and believed that the backbone of Great Britain was the yeoman farmer. Their policies of low public expenditure and low taxation were adopted by William Gladstone when he became Chancellor of the Exchequer and later Prime Minister. Classical liberalism was often associated with religious dissent and nonconformism.

Although classical liberals aspired to a minimum of state activity, they accepted the principle of government intervention in the economy from the early 19th century on, with passage of the Factory Acts. From around 1840 to 1860, laissez-faire advocates of the Manchester School and writers in The Economist were confident that their early victories would lead to a period of expanding economic and personal liberty and world peace, but would face reversals as government intervention and activity continued to expand from the 1850s. Jeremy Bentham and James Mill, although advocates of laissez-faire, non-intervention in foreign affairs, and individual liberty, believed that social institutions could be rationally redesigned through the principles of utilitarianism. The Conservative Prime Minister Benjamin Disraeli rejected classical liberalism altogether and advocated Tory democracy. By the 1870s, Herbert Spencer and other classical liberals concluded that historical development was turning against them. By the First World War, the Liberal Party had largely abandoned classical liberal principles.

The changing economic and social conditions of the 19th century led to a division between neo-classical and social (or welfare) liberals, who while agreeing on the importance of individual liberty differed on the role of the state. Neo-classical liberals, who called themselves "true liberals", saw Locke's Second Treatise as the best guide and emphasised "limited government" while social liberals supported government regulation and the welfare state. Herbert Spencer in Britain and William Graham Sumner were the leading neo-classical liberal theorists of the 19th century. The evolution from classical to social/welfare liberalism is for example reflected in Britain in the evolution of the thought of John Maynard Keynes.

Ottoman Empire
The Ottoman Empire had liberal free trade policies by the 18th century, with origins in capitulations of the Ottoman Empire, dating back to the first commercial treaties signed with France in 1536 and taken further with capitulations in 1673, in 1740 which lowered duties to only 3% for imports and exports and in 1790. Ottoman free trade policies were praised by British economists advocating free trade such as J. R. McCulloch in his Dictionary of Commerce (1834) but criticized by British politicians opposing free trade such as Prime Minister Benjamin Disraeli, who cited the Ottoman Empire as "an instance of the injury done by unrestrained competition" in the 1846 Corn Laws debate, arguing that it destroyed what had been "some of the finest manufactures of the world" in 1812.

United States
In the United States, liberalism took a strong root because it had little opposition to its ideals, whereas in Europe liberalism was opposed by many reactionary or feudal interests such as the nobility; the aristocracy, including army officers; the landed gentry; and the established church. Thomas Jefferson adopted many of the ideals of liberalism, but in the Declaration of Independence changed Locke's "life, liberty and property" to the more socially liberal "Life, Liberty and the pursuit of Happiness". As the United States grew, industry became a larger and larger part of American life; and during the term of its first populist President, Andrew Jackson, economic questions came to the forefront. The economic ideas of the Jacksonian era were almost universally the ideas of classical liberalism. Freedom, according to classical liberals, was maximised when the government took a "hands off" attitude toward the economy. Historian Kathleen G. Donohue argues: "[A]t the center of classical liberal theory [in Europe] was the idea of laissez-faire. To the vast majority of American classical liberals, however, laissez-faire did not mean no government intervention at all. On the contrary, they were more than willing to see government provide tariffs, railroad subsidies, and internal improvements, all of which benefited producers. What they condemned was intervention on behalf of consumers."

The Nation magazine espoused liberalism every week starting in 1865 under the influential editor Edwin Lawrence Godkin (1831–1902). The ideas of classical liberalism remained essentially unchallenged until a series of depressions, thought to be impossible according to the tenets of classical economics, led to economic hardship from which the voters demanded relief. In the words of William Jennings Bryan, "You shall not crucify this nation on a cross of gold". Classical liberalism remained the orthodox belief among American businessmen until the Great Depression. The Great Depression in the United States saw a sea change in liberalism, with priority shifting from the producers to consumers. Franklin D. Roosevelt's New Deal represented the dominance of modern liberalism in politics for decades. In the words of Arthur Schlesinger Jr.: "When the growing complexity of industrial conditions required increasing government intervention in order to assure more equal opportunities, the liberal tradition, faithful to the goal rather than to the dogma, altered its view of the state. ... There emerged the conception of a social welfare state, in which the national government had the express obligation to maintain high levels of employment in the economy, to supervise standards of life and labour, to regulate the methods of business competition, and to establish comprehensive patterns of social security."

Alan Wolfe summarizes the viewpoint that there is a continuous liberal understanding that includes both Adam Smith and John Maynard Keynes: "The idea that liberalism comes in two forms assumes that the most fundamental question facing mankind is how much government intervenes into the economy. ... When instead we discuss human purpose and the meaning of life, Adam Smith and John Maynard Keynes are on the same side. Both of them possessed an expansive sense of what we are put on this earth to accomplish. ... For Smith, mercantilism was the enemy of human liberty. For Keynes, monopolies were. It makes perfect sense for an eighteenth-century thinker to conclude that humanity would flourish under the market. For a twentieth century thinker committed to the same ideal, government was an essential tool to the same end."

The view that modern liberalism is a continuation of classical liberalism is controversial and disputed by many. James Kurth, Robert E. Lerner, John Micklethwait, Adrian Wooldridge and several other political scholars have argued that classical liberalism still exists today, but in the form of American conservatism. According to Deepak Lal, only in the United States does classical liberalism continue to be a significant political force through American conservatism. American libertarians also claim to be the true continuation of the classical liberal tradition.

John Locke
Central to classical liberal ideology was their interpretation of John Locke's Second Treatise of Government and A Letter Concerning Toleration, which had been written as a defence of the Glorious Revolution of 1688. Although these writings were considered too radical at the time for Britain's new rulers, Whigs, radicals and supporters of the American Revolution later came to cite them. However, much of later liberal thought was absent in Locke's writings or scarcely mentioned and his writings have been subject to various interpretations. For example, there is little mention of constitutionalism, the separation of powers and limited government.

James L. Richardson identified five central themes in Locke's writing:

 * Individualism
 * Consent
 * Rule of law and government as trustee
 * Significance of property
 * Religious toleration

Although Locke did not develop a theory of natural rights, he envisioned individuals in the state of nature as being free and equal. The individual, rather than the community or institutions, was the point of reference. Locke believed that individuals had given consent to government and therefore authority derived from the people rather than from above. This belief would influence later revolutionary movements.

As a trustee, government was expected to serve the interests of the people, not the rulers; and rulers were expected to follow the laws enacted by legislatures. Locke also held that the main purpose of men uniting into commonwealths and governments was for the preservation of their property. Despite the ambiguity of Locke's definition of property, which limited property to "as much land as a man tills, plants, improves, cultivates, and can use the product of", this principle held great appeal to individuals possessed of great wealth.

Locke held that the individual had the right to follow his own religious beliefs and that the state should not impose a religion against Dissenters, but there were limitations. No tolerance should be shown for atheists, who were seen as amoral, or to Catholics, who were seen as owing allegiance to the Pope over their own national government.

Adam Smith

Adam Smith's The Wealth of Nations, published in 1776, was to provide most of the ideas of economics, at least until the publication of John Stuart Mill's Principles of Political Economy in 1848. Smith addressed the motivation for economic activity, the causes of prices and the distribution of wealth and the policies the state should follow to maximise wealth.

Smith wrote that as long as supply, demand, prices and competition were left free of government regulation, the pursuit of material self-interest, rather than altruism, would maximise the wealth of a society through profit-driven production of goods and services. An "invisible hand" directed individuals and firms to work toward the public good as an unintended consequence of efforts to maximise their own gain. This provided a moral justification for the accumulation of wealth, which had previously been viewed by some as sinful.

He assumed that workers could be paid wages as low as was necessary for their survival, which was later transformed by David Ricardo and Thomas Robert Malthus into the "iron law of wages". His main emphasis was on the benefit of free internal and international trade, which he thought could increase wealth through specialisation in production. He also opposed restrictive trade preferences, state grants of monopolies and employers' organisations and trade unions. Government should be limited to defence, public works and the administration of justice, financed by taxes based on income.

Smith's economics was carried into practice in the nineteenth century with the lowering of tariffs in the 1820s, the repeal of the Poor Relief Act that had restricted the mobility of labour in 1834 and the end of the rule of the East India Company over India in 1858.

Classical economics
In addition to Smith's legacy, Say's law, Thomas Robert Malthus' theories of population and David Ricardo's iron law of wages became central doctrines of classical economics. The pessimistic nature of these theories provided a basis for criticism of capitalism by its opponents and helped perpetuate the tradition of calling economics the "dismal science".

Jean-Baptiste Say was a French economist who introduced Smith's economic theories into France and whose commentaries on Smith were read in both France and Britain. Say challenged Smith's labour theory of value, believing that prices were determined by utility and also emphasised the critical role of the entrepreneur in the economy. However, neither of those observations became accepted by British economists at the time. His most important contribution to economic thinking was Say's law, which was interpreted by classical economists that there could be no overproduction in a market and that there would always be a balance between supply and demand. This general belief influenced government policies until the 1930s. Following this law, since the economic cycle was seen as self-correcting, government did not intervene during periods of economic hardship because it was seen as futile.

Malthus wrote two books, An Essay on the Principle of Population (published in 1798) and Principles of Political Economy (published in 1820). The second book which was a rebuttal of Say's law had little influence on contemporary economists. However, his first book became a major influence on classical liberalism. In that book, Malthus claimed that population growth would outstrip food production because population grew geometrically while food production grew arithmetically. As people were provided with food, they would reproduce until their growth outstripped the food supply. Nature would then provide a check to growth in the forms of vice and misery. No gains in income could prevent this and any welfare for the poor would be self-defeating. The poor were in fact responsible for their own problems which could have been avoided through self-restraint.

Ricardo, who was an admirer of Smith, covered many of the same topics, but while Smith drew conclusions from broadly empirical observations he used deduction, drawing conclusions by reasoning from basic assumptions While Ricardo accepted Smith's labour theory of value, he acknowledged that utility could influence the price of some rare items. Rents on agricultural land were seen as the production that was surplus to the subsistence required by the tenants. Wages were seen as the amount required for workers' subsistence and to maintain current population levels. According to his iron law of wages, wages could never rise beyond subsistence levels. Ricardo explained profits as a return on capital, which itself was the product of labour, but a conclusion many drew from his theory was that profit was a surplus appropriated by capitalists to which they were not entitled.

Utilitarianism
The central concept of utilitarianism, which was developed by Jeremy Bentham, was that public policy should seek to provide "the greatest happiness of the greatest number". While this could be interpreted as a justification for state action to reduce poverty, it was used by classical liberals to justify inaction with the argument that the net benefit to all individuals would be higher.

Utilitarianism provided British governments with the political justification to implement economic liberalism, which was to dominate economic policy from the 1830s. Although utilitarianism prompted legislative and administrative reform and John Stuart Mill's later writings on the subject foreshadowed the welfare state, it was mainly used as a justification for laissez-faire.

Political economy
Classical liberals following Mill saw utility as the foundation for public policies. This broke both with conservative "tradition" and Lockean "natural rights", which were seen as irrational. Utility, which emphasises the happiness of individuals, became the central ethical value of all Mill-style liberalism. Although utilitarianism inspired wide-ranging reforms, it became primarily a justification for laissez-faire economics. However, Mill adherents rejected Smith's belief that the "invisible hand" would lead to general benefits and embraced Malthus' view that population expansion would prevent any general benefit and Ricardo's view of the inevitability of class conflict. Laissez-faire was seen as the only possible economic approach and any government intervention was seen as useless and harmful. The Poor Law Amendment Act 1834 was defended on "scientific or economic principles" while the authors of the Poor Relief Act 1601 were seen as not having had the benefit of reading Malthus.

However, commitment to laissez-faire was not uniform and some economists advocated state support of public works and education. Classical liberals were also divided on free trade as Ricardo expressed doubt that the removal of grain tariffs advocated by Richard Cobden and the Anti-Corn Law League would have any general benefits. Most classical liberals also supported legislation to regulate the number of hours that children were allowed to work and usually did not oppose factory reform legislation.

Despite the pragmatism of classical economists, their views were expressed in dogmatic terms by such popular writers as Jane Marcet and Harriet Martineau. The strongest defender of laissez-faire was The Economist founded by James Wilson in 1843. The Economist criticised Ricardo for his lack of support for free trade and expressed hostility to welfare, believing that the lower orders were responsible for their economic circumstances. The Economist took the position that regulation of factory hours was harmful to workers and also strongly opposed state support for education, health, the provision of water, and granting of patents and copyrights.

The Economist also campaigned against the Corn Laws that protected landlords in the United Kingdom of Great Britain and Ireland against competition from less expensive foreign imports of cereal products. A rigid belief in laissez-faire guided the government response in 1846–1849 to the Great Famine in Ireland, during which an estimated 1.5 million people died. The minister responsible for economic and financial affairs, Charles Wood, expected that private enterprise and free trade, rather than government intervention, would alleviate the famine. The Corn Laws were finally repealed in 1846 by the removal of tariffs on grain which kept the price of bread artificially high, but it came too late to stop the Irish famine, partly because it was done in stages over three years.

Free trade and world peace
Several liberals, including Smith and Cobden, argued that the free exchange of goods between nations could lead to world peace. Erik Gartzke states: "Scholars like Montesquieu, Adam Smith, Richard Cobden, Norman Angell, and Richard Rosecrance have long speculated that free markets have the potential to free states from the looming prospect of recurrent warfare". American political scientists John R. Oneal and Bruce M. Russett, well known for their work on the democratic peace theory, state: "The classical liberals advocated policies to increase liberty and prosperity. They sought to empower the commercial class politically and to abolish royal charters, monopolies, and the protectionist policies of mercantilism so as to encourage entrepreneurship and increase productive efficiency. They also expected democracy and laissez-faire economics to diminish the frequency of war."

In The Wealth of Nations, Smith argued that as societies progressed from hunter gatherers to industrial societies the spoils of war would rise, but that the costs of war would rise further and thus making war difficult and costly for industrialised nations: "[T]he honours, the fame, the emoluments of war, belong not to [the middle and industrial classes]; the battle-plain is the harvest field of the aristocracy, watered with the blood of the people. ... Whilst our trade rested upon our foreign dependencies, as was the case in the middle of the last century...force and violence, were necessary to command our customers for our manufacturers...But war, although the greatest of consumers, not only produces nothing in return, but, by abstracting labour from productive employment and interrupting the course of trade, it impedes, in a variety of indirect ways, the creation of wealth; and, should hostilities be continued for a series of years, each successive war-loan will be felt in our commercial and manufacturing districts with an augmented pressure" "[B]y virtue of their mutual interest does nature unite people against violence and war, for the concept of cosmopolitan right does not protect them from it. The spirit of trade cannot coexist with war, and sooner or later this spirit dominates every people. For among all those powers (or means) that belong to a nation, financial power may be the most reliable in forcing nations to pursue the noble cause of peace (though not from moral motives); and wherever in the world war threatens to break out, they will try to head it off through mediation, just as if they were permanently leagued for this purpose."

Cobden believed that military expenditures worsened the welfare of the state and benefited a small, but concentrated elite minority, summing up British imperialism, which he believed was the result of the economic restrictions of mercantilist policies. To Cobden and many classical liberals, those who advocated peace must also advocate free markets. The belief that free trade would promote peace was widely shared by English liberals of the 19th and early 20th century, leading the economist John Maynard Keynes (1883–1946), who was a classical liberal in his early life, to say that this was a doctrine on which he was "brought up" and which he held unquestioned only until the 1920s. In his review of a book on Keynes, Michael S. Lawlor argues that it may be in large part due to Keynes' contributions in economics and politics, as in the implementation of the Marshall Plan and the way economies have been managed since his work, "that we have the luxury of not facing his unpalatable choice between free trade and full employment". A related manifestation of this idea was the argument of Norman Angell (1872–1967), most famously before World War I in The Great Illusion (1909), that the interdependence of the economies of the major powers was now so great that war between them was futile and irrational; and therefore unlikely.

Notable thinkers

 * Thomas Hobbes (1588–1679)
 * James Harrington (1611–1677)
 * John Locke (1632–1704)
 * Montesquieu (1689–1755)
 * David Hume (1711–1776)
 * Voltaire (1694–1778)
 * Jean-Jacques Rousseau (1712–1778)
 * Benjamin Franklin (1706–1790)
 * Adam Smith (1723–1790)
 * Edward Gibbon (1737–1794)
 * Immanuel Kant (1724–1804)
 * Anders Chydenius (1729–1803)
 * Thomas Paine (1737–1809)
 * Cesare Beccaria (1738–1794)
 * Marquis de Condorcet (1743–1794)
 * Thomas Jefferson (1743–1826)
 * Jeremy Bentham (1748–1832)
 * Gaetano Filangieri (1753–1788)
 * Benjamin Constant (1767–1830)
 * David Ricardo (1772–1823)
 * Alexis de Tocqueville (1805–1859)
 * Giuseppe Mazzini (1805–1872)
 * John Stuart Mill (1806–1872)
 * William Ewart Gladstone (1809–1898)
 * Horace Greeley (1811–1873)
 * Fukuzawa Yukichi (1835–1901)
 * Henry George (1839–1897)
 * Friedrich Naumann (1860–1919)
 * Ludwig Von Mises (1881–1973)
 * Friedrich Hayek (1899–1992)
 * Karl Popper (1902–1994)
 * Raymond Aron (1905–1983)
 * Milton Friedman (1912–2006)
 * Robert Nozick (1938–2002)

Classical liberal parties worldwide
Although general libertarian, liberal-conservative and some right-wing populist political parties are also included in classical liberal parties in a broad sense, but only general classical liberal parties such as Germany's FDP, Denmark's Liberal Alliance and Thailand Democrat Party should be listed.

Classical liberal parties or parties with classical liberal factions

 * Argentina: Liberty Advances,
 * Australia: Liberal Party of Australia, Liberal Democratic Party
 * Austria: NEOS – The New Austria and Liberal Forum, Freedom Party of Austria (factions)
 * Belgium: Open Flemish Liberals and Democrats, Reformist Movement
 * Brazil: New Party
 * Canada: People's Party
 * Chile: Evópoli
 * Denmark: Venstre, Liberal Alliance
 * Estonia: Estonian Reform Party
 * France: Renaissance
 * Georgia: Girchi — More Freedom, Girchi
 * Germany: Free Democratic Party
 * Iceland: Reform Party
 * India: Lok Satta Party
 * Latvia: For Latvia's Development, Movement For!
 * Lithuania: Liberals' Movement
 * Luxembourg: Democratic Party
 * Netherlands: People's Party for Freedom and Democracy, Belang van Nederland
 * New Zealand: New Zealand National Party, ACT New Zealand
 * Norway: Venstre, Progress Party
 * Poland: Modern, Civic Platform
 * Portugal: Liberal Initiative
 * Romania: National Liberal Party
 * Russia: PARNAS
 * Serbia: Liberal Democratic Party of Serbia
 * Slovakia: Freedom and Solidarity
 * South Africa: Democratic Alliance
 * Sweden: Liberals, Classical Liberal Party
 * Switzerland: FDP.The Liberals
 * Thailand: Democrat Party
 * Turkey: Liberal Democratic Party
 * United Kingdom: Liberal Party
 * United States: Liberal Party USA
 * Venezuela: Come Venezuela

Historical classical liberal parties or parties with classical liberal factions (Since 1900s)

 * Belgium: Liberal Party, Party for Freedom and Progress, Liberal Reformist Party
 * Chile: Liberal Party, Amplitude
 * Germany: German Democratic Party
 * India: Swatantra Party
 * Ireland: Progressive Democrats
 * Japan: Liberal Party (1998), Liberal League
 * Netherlands: Freedom Party
 * New Zealand: New Zealand Liberal Party, United Party, New Zealand Party
 * South Korea: New Democratic Party
 * Switzerland: Free Democratic Party of Switzerland, Liberal Party of Switzerland
 * United Kingdom: Liberal Party

Criticism
Tadd Wilson, writing for the libertarian Foundation for Economic Education, noted that "Many on the left and right criticize classical liberals for focusing purely on economics and politics to the neglect of a vital issue: culture."

Helena Vieira, writing for the London School of Economics, argued that classical liberalism "may contradict some fundamental democratic principles as they are inconsistent with the principle of unanimity (also known as the Pareto Principle) – the idea that if everyone in society prefers a policy A to a policy B, then the former should be adopted."

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title: Classical liberalism


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Cat

The cat (Felis catus), commonly referred to as the domestic cat or house cat, is a small domesticated carnivorous mammal. It is the only domesticated species of the family Felidae. Recent advances in archaeology and genetics have shown that the domestication of the cat occurred in the Near East around 7500 BC. It is commonly kept as a house pet and farm cat, but also ranges freely as a feral cat avoiding human contact. Valued by humans for companionship and its ability to kill vermin, the cat's retractable claws are adapted to killing small prey like mice and rats. It has a strong, flexible body, quick reflexes, and sharp teeth, and its night vision and sense of smell are well developed. It is a social species, but a solitary hunter and a crepuscular predator. Cat communication includes vocalizations like meowing, purring, trilling, hissing, growling, and grunting as well as cat body language. It can hear sounds too faint or too high in frequency for human ears, such as those made by small mammals. It secretes and perceives pheromones.

Female domestic cats can have kittens from spring to late autumn in temperate zones and throughout the year in equatorial regions, with litter sizes often ranging from two to five kittens. Domestic cats are bred and shown at events as registered pedigreed cats, a hobby known as cat fancy. Animal population control of cats may be achieved by spaying and neutering, but their proliferation and the abandonment of pets has resulted in large numbers of feral cats worldwide, contributing to the extinction of bird, mammal, and reptile species.

the domestic cat was the second most popular pet in the United States, with 95.6 million cats owned and around 42 million households owning at least one cat. In the United Kingdom, 26% of adults have a cat, with an estimated population of 10.9 million pet cats  there were an estimated 220 million owned and 480 million stray cats in the world.

Etymology and naming
The origin of the English word cat, Old English catt, is thought to be the Late Latin word cattus, which was first used at the beginning of the 6th century. The Late Latin word may be derived from an unidentified African language. The Nubian word kaddîska 'wildcat' and Nobiin kadīs are possible sources or cognates.

The forms might also have derived from an ancient Germanic word that was absorbed into Latin and then into Greek, Syriac, and Arabic. The word may be derived from Germanic and Northern European languages, and ultimately be borrowed from Uralic, cf. Northern Sámi gáđfi, 'female stoat', and Hungarian hölgy, 'lady, female stoat'; from Proto-Uralic *käďwä, 'female (of a furred animal)'.

The English puss, extended as pussy and pussycat, is attested from the 16th century and may have been introduced from Dutch poes or from Low German puuskatte, related to Swedish kattepus, or Norwegian pus, pusekatt. Similar forms exist in Lithuanian puižė and Irish puisín or puiscín. The etymology of this word is unknown, but it may have arisen from a sound used to attract a cat.

A male cat is called a tom or tomcat (or a gib, if neutered). A female is called a queen (or sometimes a molly, if spayed). A juvenile cat is referred to as a kitten. In Early Modern English, the word kitten was interchangeable with the now-obsolete word catling. A group of cats can be referred to as a clowder or a glaring.

Taxonomy
The scientific name Felis catus was proposed by Carl Linnaeus in 1758 for a domestic cat. Felis catus domesticus was proposed by Johann Christian Polycarp Erxleben in 1777. Felis daemon proposed by Konstantin Satunin in 1904 was a black cat from the Transcaucasus, later identified as a domestic cat.

In 2003, the International Commission on Zoological Nomenclature ruled that the domestic cat is a distinct species, namely Felis catus. In 2007, the modern domesticated subspecies F. silvestris catus sampled worldwide was considered to have likely descended from the African wildcat (F. lybica), following results of phylogenetic research. In 2017, the IUCN Cat Classification Taskforce followed the recommendation of the ICZN in regarding the domestic cat as a distinct species, Felis catus.

Evolution
The domestic cat is a member of the Felidae, a family that had a common ancestor about. The evolutionary radiation of the Felidae began in Asia during the Miocene around. Analysis of mitochondrial DNA of all Felidae species indicates a radiation at. The genus Felis genetically diverged from other Felidae around. Results of phylogenetic research shows that the wild members of this genus evolved through sympatric or parapatric speciation, whereas the domestic cat evolved through artificial selection. The domestic cat and its closest wild ancestor are diploid and both possess 38 chromosomes and roughly 20,000 genes.

Domestication
It was long thought that the domestication of the cat began in ancient Egypt, where cats were venerated from around 3100 BC. However, the earliest known indication for the taming of an African wildcat was excavated close by a human Neolithic grave in Shillourokambos, southern Cyprus, dating to about 7500–7200 BC. Since there is no evidence of native mammalian fauna on Cyprus, the inhabitants of this Neolithic village most likely brought the cat and other wild mammals to the island from the Middle Eastern mainland. Scientists therefore assume that African wildcats were attracted to early human settlements in the Fertile Crescent by rodents, in particular the house mouse (Mus musculus), and were tamed by Neolithic farmers. This mutual relationship between early farmers and tamed cats lasted thousands of years. As agricultural practices spread, so did tame and domesticated cats. Wildcats of Egypt contributed to the maternal gene pool of the domestic cat at a later time.

The earliest known evidence for the occurrence of the domestic cat in Greece dates to around 1200 BC. Greek, Phoenician, Carthaginian and Etruscan traders introduced domestic cats to southern Europe. By the 5th century BC, they were familiar animals around settlements in Magna Graecia and Etruria. During the Roman Empire, they were introduced to Corsica and Sardinia before the beginning of the 1st century AD. By the end of the Western Roman Empire in the 5th century, the Egyptian domestic cat lineage had arrived in a Baltic Sea port in northern Germany.

The leopard cat (Prionailurus bengalensis) was tamed independently in China around 5500 BC. This line of partially domesticated cats leaves no trace in the domestic cat populations of today.

During domestication, cats have undergone only minor changes in anatomy and behavior, and they are still capable of surviving in the wild. Several natural behaviors and characteristics of wildcats may have pre-adapted them for domestication as pets. These traits include their small size, social nature, obvious body language, love of play, and high intelligence. Since they practice rigorous grooming habits and have an instinctual drive to bury and hide their urine and feces, they are generally much less messy than other domesticated animals. Captive Leopardus cats may also display affectionate behavior toward humans but were not domesticated. House cats often mate with feral cats. Hybridisation between domestic and other Felinae species is also possible, producing hybrids such as the Kellas cat in Scotland.

Development of cat breeds started in the mid 19th century. An analysis of the domestic cat genome revealed that the ancestral wildcat genome was significantly altered in the process of domestication, as specific mutations were selected to develop cat breeds. Most breeds are founded on random-bred domestic cats. Genetic diversity of these breeds varies between regions, and is lowest in purebred populations, which show more than 20 deleterious genetic disorders.

Size
The domestic cat has a smaller skull and shorter bones than the European wildcat. It averages about 46 cm in head-to-body length and 23 - 25 cm in height, with about 30 cm long tails. Males are larger than females. Adult domestic cats typically weigh 4 - 5 kg.

Skeleton
Cats have seven cervical vertebrae (as do most mammals); 13 thoracic vertebrae (humans have 12); seven lumbar vertebrae (humans have five); three sacral vertebrae (as do most mammals, but humans have five); and a variable number of caudal vertebrae in the tail (humans have only three to five vestigial caudal vertebrae, fused into an internal coccyx). The extra lumbar and thoracic vertebrae account for the cat's spinal mobility and flexibility. Attached to the spine are 13 ribs, the shoulder, and the pelvis. Unlike human arms, cat forelimbs are attached to the shoulder by free-floating clavicle bones which allow them to pass their body through any space into which they can fit their head.

Skull
The cat skull is unusual among mammals in having very large eye sockets and a powerful specialized jaw. Within the jaw, cats have teeth adapted for killing prey and tearing meat. When it overpowers its prey, a cat delivers a lethal neck bite with its two long canine teeth, inserting them between two of the prey's vertebrae and severing its spinal cord, causing irreversible paralysis and death. Compared to other felines, domestic cats have narrowly spaced canine teeth relative to the size of their jaw, which is an adaptation to their preferred prey of small rodents, which have small vertebrae.

The premolar and first molar together compose the carnassial pair on each side of the mouth, which efficiently shears meat into small pieces, like a pair of scissors. These are vital in feeding, since cats' small molars cannot chew food effectively, and cats are largely incapable of mastication. Cats tend to have better teeth than most humans, with decay generally less likely because of a thicker protective layer of enamel, a less damaging saliva, less retention of food particles between teeth, and a diet mostly devoid of sugar. Nonetheless, they are subject to occasional tooth loss and infection.

Claws
Cats have protractible and retractable claws. In their normal, relaxed position, the claws are sheathed with the skin and fur around the paw's toe pads. This keeps the claws sharp by preventing wear from contact with the ground and allows for the silent stalking of prey. The claws on the forefeet are typically sharper than those on the hindfeet. Cats can voluntarily extend their claws on one or more paws. They may extend their claws in hunting or self-defense, climbing, kneading, or for extra traction on soft surfaces. Cats shed the outside layer of their claw sheaths when scratching rough surfaces.

Most cats have five claws on their front paws and four on their rear paws. The dewclaw is proximal to the other claws. More proximally is a protrusion which appears to be a sixth "finger". This special feature of the front paws on the inside of the wrists has no function in normal walking but is thought to be an antiskidding device used while jumping. Some cat breeds are prone to having extra digits ("polydactyly"). Polydactylous cats occur along North America's northeast coast and in Great Britain.

Ambulation
The cat is digitigrade. It walks on the toes, with the bones of the feet making up the lower part of the visible leg. Unlike most mammals, it uses a "pacing" gait and moves both legs on one side of the body before the legs on the other side. It registers directly by placing each hind paw close to the track of the corresponding fore paw, minimizing noise and visible tracks. This also provides sure footing for hind paws when navigating rough terrain. As it speeds up from walking to trotting, its gait changes to a "diagonal" gait: The diagonally opposite hind and fore legs move simultaneously.

Balance
Cats are generally fond of sitting in high places or perching. A higher place may serve as a concealed site from which to hunt; domestic cats strike prey by pouncing from a perch such as a tree branch. Another possible explanation is that height gives the cat a better observation point, allowing it to survey its territory. A cat falling from heights of up to 3 m can right itself and land on its paws.

During a fall from a high place, a cat reflexively twists its body and rights itself to land on its feet using its acute sense of balance and flexibility. This reflex is known as the cat righting reflex. A cat always rights itself in the same way during a fall, if it has enough time to do so, which is the case in falls of 90 cm or more. How cats are able to right themselves when falling has been investigated as the "falling cat problem".

Coats
The cat family (Felidae) can pass down many colors and patterns to their offspring. The domestic cat genes MC1R and ASIP allow color variety in their coats. The feline ASIP gene consists of three coding exons. Three novel microsatellite markers linked to ASIP were isolated from a domestic cat BAC clone containing this gene to perform linkage analysis on 89 domestic cats segregated for melanism. The domestic cat family demonstrated a cosegregation between the ASIP allele and coat black coloration.

Vision
Cats have excellent night vision and can see at one sixth the light level required for human vision. This is partly the result of cat eyes having a tapetum lucidum, which reflects any light that passes through the retina back into the eye, thereby increasing the eye's sensitivity to dim light. Large pupils are an adaptation to dim light. The domestic cat has slit pupils, which allow it to focus bright light without chromatic aberration. At low light, a cat's pupils expand to cover most of the exposed surface of its eyes. The domestic cat has rather poor color vision and only two types of cone cells, optimized for sensitivity to blue and yellowish green; its ability to distinguish between red and green is limited. A response to middle wavelengths from a system other than the rod cells might be due to a third type of cone. This appears to be an adaptation to low light levels rather than representing true trichromatic vision. Cats also have a nictitating membrane, allowing them to blink without hindering their vision.

Hearing
The domestic cat's hearing is most acute in the range of 500 Hz to 32 kHz. It can detect an extremely broad range of frequencies ranging from 55 Hz to 79 kHz, whereas humans can only detect frequencies between 20 Hz and 20 kHz. It can hear a range of 10.5 octaves, while humans and dogs can hear ranges of about 9 octaves. Its hearing sensitivity is enhanced by its large movable outer ears, the pinnae, which amplify sounds and help detect the location of a noise. It can detect ultrasound, which enables it to detect ultrasonic calls made by rodent prey. Recent research has shown that cats have socio-spatial cognitive abilities to create mental maps of owners' locations based on hearing owners' voices.

Smell
Cats have an acute sense of smell, due in part to their well-developed olfactory bulb and a large surface of olfactory mucosa, about 5.8 cm2 in area, which is about twice that of humans. Cats and many other animals have a Jacobson's organ in their mouths that is used in the behavioral process of flehmening. It allows them to sense certain aromas in a way that humans cannot. Cats are sensitive to pheromones such as 3-mercapto-3-methylbutan-1-ol, which they use to communicate through urine spraying and marking with scent glands. Many cats also respond strongly to plants that contain nepetalactone, especially catnip, as they can detect that substance at less than one part per billion. About 70–80% of cats are affected by nepetalactone. This response is also produced by other plants, such as silver vine (Actinidia polygama) and the herb valerian; it may be caused by the smell of these plants mimicking a pheromone and stimulating cats' social or sexual behaviors.

Taste
Cats have relatively few taste buds compared to humans (470 or so, compared to more than 9,000 on the human tongue). Domestic and wild cats share a taste receptor gene mutation that keeps their sweet taste buds from binding to sugary molecules, leaving them with no ability to taste sweetness. They, however, possess taste bud receptors specialized for acids, amino acids like protein, and bitter tastes. Their taste buds possess the receptors needed to detect umami. However, these receptors contain molecular changes that make cat taste umami different from that of humans. In humans, they detect the amino acids glutamic acid and aspartic acid, but in cats, they instead detect inosine monophosphate and l-Histidine. These molecules are particularly enriched in tuna. This has been argued is why cats find tuna so palatable: as put by researchers into cat taste, "the specific combination of the high IMP and free l-Histidine contents of tuna, which produces a strong umami taste synergy that is highly preferred by cats". One of the researchers in this research has stated, "I think umami is as important for cats as sweet is for humans".

Cats also have a distinct temperature preference for their food, preferring food with a temperature around 38 C which is similar to that of a fresh kill; some cats reject cold food (which would signal to the cat that the "prey" item is long dead and therefore possibly toxic or decomposing).

Whiskers
To aid with navigation and sensation, cats have dozens of movable whiskers (vibrissae) over their body, especially their faces. These provide information on the width of gaps and on the location of objects in the dark, both by touching objects directly and by sensing air currents; they also trigger protective blink reflexes to protect the eyes from damage.

Behavior
Outdoor cats are active both day and night, although they tend to be slightly more active at night. Domestic cats spend the majority of their time in the vicinity of their homes but can range many hundreds of meters from this central point. They establish territories that vary considerably in size, in one study ranging 7 - 28 ha. The timing of cats' activity is quite flexible and varied but being low-light predators, they are generally crepuscular, which means they tend to be more active near dawn and dusk. However, house cats' behavior is also influenced by human activity and they may adapt to their owners' sleeping patterns to some extent.

Cats conserve energy by sleeping more than most animals, especially as they grow older. The daily duration of sleep varies, usually between 12 and 16 hours, with 13 and 14 being the average. Some cats can sleep as much as 20 hours. The term "cat nap" for a short rest refers to the cat's tendency to fall asleep (lightly) for a brief period. While asleep, cats experience short periods of rapid eye movement sleep often accompanied by muscle twitches, which suggests they are dreaming.

Sociability

The social behavior of the domestic cat ranges from widely dispersed individuals to feral cat colonies that gather around a food source, based on groups of co-operating females. Within such groups, one cat is usually dominant over the others. Each cat in a colony holds a distinct territory, with sexually active males having the largest territories, which are about 10 times larger than those of female cats and may overlap with several females' territories. These territories are marked by urine spraying, by rubbing objects at head height with secretions from facial glands, and by defecation. Between these territories are neutral areas where cats watch and greet one another without territorial conflicts. Outside these neutral areas, territory holders usually chase away stranger cats, at first by staring, hissing, and growling, and, if that does not work, by short and violent, noisy attacks. Though cats do not have a social survival strategy or herd behavior, they always hunt alone.

Life in proximity to humans and other domestic animals has led to a symbiotic social adaptation in cats, and cats may express great affection toward humans or other animals. Ethologically, a cat's human keeper functions as if a mother surrogates. Adult cats live their lives in a kind of extended kittenhood, a form of behavioral neoteny. Their high-pitched sounds may mimic the cries of a hungry human infant, making them particularly difficult for humans to ignore. Some pet cats are poorly socialized. In particular, older cats show aggressiveness toward newly arrived kittens, which include biting and scratching; this type of behavior is known as feline asocial aggression.

Redirected aggression is a common form of aggression which can occur in multiple cat households. In redirected aggression, there is usually something that agitates the cat: this could be a sight, sound, or another source of stimuli which causes a heightened level of anxiety or arousal. If the cat cannot attack the stimuli, it may direct anger elsewhere by attacking or directing aggression to the nearest cat, dog, human or other being.

Domestic cats' scent rubbing behavior toward humans or other cats is thought to be a feline means of social bonding.

Communication
Domestic cats use many vocalizations for communication, including purring, trilling, hissing, growling/snarling, grunting, and several different forms of meowing. Their body language, including position of ears and tail, relaxation of the whole body, and kneading of the paws, are all indicators of mood. The tail and ears are particularly important social signal mechanisms; a raised tail indicates a friendly greeting, and flattened ears indicate hostility. Tail-raising also indicates the cat's position in the group's social hierarchy, with dominant individuals raising their tails less often than subordinate ones. Feral cats are generally silent. Nose-to-nose touching is also a common greeting and may be followed by social grooming, which is solicited by one of the cats raising and tilting its head.

Purring may have developed as an evolutionary advantage as a signaling mechanism of reassurance between mother cats and nursing kittens, who are thought to use it as a care-soliciting signal. Post-nursing cats also often purr as a sign of contentment: when being petted, becoming relaxed, or eating. Even though purring is popularly interpreted as indicative of pleasure, it has been recorded in a wide variety of circumstances, most of which involve physical contact between the cat and another, presumably trusted individual. Some cats have been observed to purr continuously when chronically ill or in apparent pain.

The exact mechanism by which cats purr has long been elusive, but it has been proposed that purring is generated via a series of sudden build-ups and releases of pressure as the glottis is opened and closed, which causes the vocal folds to separate forcefully. The laryngeal muscles in control of the glottis are thought to be driven by a neural oscillator which generates a cycle of contraction and release every 30–40 milliseconds (giving a frequency of 33 to 25 Hz).

Domestic cats observed in rescue facilities have 276 morphologically distinct facial expressions based on 26 facial movements; each facial expression corresponds to different social functions that are likely influenced by domestication. Facial expressions have helped researchers detect pain in cats. The feline grimace scale's five criteria ear position, orbital tightening, muzzle tension, whisker change, and head position indicated the presence of acute pain in cats.

Grooming
Cats are known for spending considerable amounts of time licking their coats to keep them clean. The cat's tongue has backward-facing spines about 0.5 millimetre long, called lingual papillae, which contain keratin making them rigid. The papillae act like a hairbrush, and some cats, particularly long-haired cats, occasionally regurgitate sausage-shaped 2 – long hairballs of fur that have collected in their stomachs from grooming. Hairballs can be prevented with remedies that ease elimination of the hair through the gut, as well as regular grooming of the coat with a comb or stiff brush.

Fighting
Among domestic cats, males are more likely to fight than females. Among feral cats, the most common reason for cat fighting is competition between two males to mate with a female. In such cases, most fights are won by the heavier male. Another common reason for fighting in domestic cats is the difficulty of establishing territories within a small home. Female cats also fight over territory or to defend their kittens. Neutering will decrease or eliminate this behavior in many cases, suggesting that the behavior is linked to sex hormones.

When cats become aggressive, they try to make themselves appear larger and more threatening by raising their fur, arching their backs, turning sideways, and hissing or spitting. Often, the ears are pointed down and back to avoid damage to the inner ear and potentially listen for any changes behind them while focused forward. Cats may also vocalize loudly and bare their teeth in an effort to further intimidate their opponents. Fights usually consist of grappling and delivering slaps to the face and body with the forepaws, as well as bites. Cats also throw themselves to the ground in a defensive posture to rake their opponent's belly with their hind legs.

Serious damage is rare, as the fights are usually short in duration, with the loser running away with little more than a few scratches to the face and ears. Fights for mating rights are typically more severe, and injuries may include deep puncture wounds and lacerations. Normally, serious injuries from fighting are limited to infections from scratches and bites, though these can occasionally kill cats if untreated. In addition, bites are probably the main route of transmission of the feline immunodeficiency virus. Sexually active males are usually involved in many fights during their lives and often have decidedly battered faces with obvious scars and cuts to their ears and nose. Cats are willing to threaten animals larger than them to defend their territory, such as dogs and foxes.

Hunting and feeding
The shape and structure of cats' cheeks is insufficient to allow them to take in liquids using suction. Therefore, when drinking, they lap with the tongue to draw liquid upward into their mouths. Lapping at a rate of four times a second, the cat touches the smooth tip of its tongue to the surface of the water, and quickly retracts it like a corkscrew, drawing water upward.

Feral cats and free-fed house cats consume several small meals in a day. The frequency and size of meals varies between individuals. They select food based on its temperature, smell and texture; they dislike chilled foods and respond most strongly to moist foods rich in amino acids, which are similar to meat. Cats reject novel flavors (a response termed neophobia) and learn quickly to avoid foods that have tasted unpleasant in the past. It is also a common misconception that cats like milk/cream, as they tend to avoid sweet food and milk. Most adult cats are lactose intolerant; the sugar in milk is not easily digested and may cause soft stools or diarrhea. Some also develop odd eating habits and like to eat or chew on things like wool, plastic, cables, paper, string, aluminum foil, or even coal. This condition, pica, can threaten their health, depending on the amount and toxicity of the items eaten.

Cats hunt small prey, primarily birds and rodents, and are often used as a form of pest control. Other common small creatures such as lizards and snakes may also become prey. Cats use two hunting strategies, either stalking prey actively, or waiting in ambush until an animal comes close enough to be captured. The strategy used depends on the prey species in the area, with cats waiting in ambush outside burrows, but tending to actively stalk birds. Domestic cats are a major predator of wildlife in the United States, killing an estimated 1.3 to 4.0 billion birds and 6.3 to 22.3 billion mammals annually.

Certain species appear more susceptible than others; in one English village, for example, 30% of house sparrow mortality was linked to the domestic cat. In the recovery of ringed robins (Erithacus rubecula) and dunnocks (Prunella modularis) in Britain, 31% of deaths were a result of cat predation. In parts of North America, the presence of larger carnivores such as coyotes which prey on cats and other small predators reduces the effect of predation by cats and other small predators such as opossums and raccoons on bird numbers and variety.

Perhaps the best-known element of cats' hunting behavior, which is commonly misunderstood and often appalls cat owners because it looks like torture, is that cats often appear to "play" with prey by releasing and recapturing it. This cat and mouse behavior is due to an instinctive imperative to ensure that the prey is weak enough to be killed without endangering the cat.

Another poorly understood element of cat hunting behavior is the presentation of prey to human guardians. One explanation is that cats adopt humans into their social group and share excess kill with others in the group according to the dominance hierarchy, in which humans are reacted to as if they are at or near the top. Another explanation is that they attempt to teach their guardians to hunt or to help their human as if feeding "an elderly cat, or an inept kitten". This hypothesis is inconsistent with the fact that male cats also bring home prey, despite males having negligible involvement in raising kittens.

Play
Domestic cats, especially young kittens, are known for their love of play. This behavior mimics hunting and is important in helping kittens learn to stalk, capture, and kill prey. Cats also engage in play fighting, both with each other and with humans. This behavior may be a way for cats to practice the skills needed for real combat, and it might also reduce the fear that they associate with launching attacks on other animals.

Cats also tend to play with toys more when they are hungry. Owing to the close similarity between play and hunting, cats prefer to play with objects that resemble prey, such as small furry toys that move rapidly, but rapidly lose interest. They become habituated to a toy they have played with before. String is often used as a toy, but if it is eaten, it can become caught at the base of the cat's tongue and then move into the intestines, a medical emergency which can cause serious illness, even death. Owing to the risks posed by cats eating string, it is sometimes replaced with a laser pointer dot, which cats may chase.

Reproduction
The cat secretes and perceives pheromones. Female cats, called queens, are polyestrous with several estrus cycles during a year, lasting usually 21 days. They are usually ready to mate between early February and August in northern temperate zones and throughout the year in equatorial regions.

Several males, called tomcats, are attracted to a female in heat. They fight over her, and the victor wins the right to mate. At first, the female rejects the male, but eventually, the female allows the male to mate. The female utters a loud yowl as the male pulls out of her because a male cat's penis has a band of about 120–150 backward-pointing penile spines, which are about 1 mm long; upon withdrawal of the penis, the spines may provide the female with increased sexual stimulation, which acts to induce ovulation.

After mating, the female cleans her vulva thoroughly. If a male attempts to mate with her at this point, the female attacks him. After about 20 to 30 minutes, once the female is finished grooming, the cycle will repeat. Because ovulation is not always triggered by a single mating, females may not be impregnated by the first male with which they mate. Furthermore, cats are superfecund; that is, a female may mate with more than one male when she is in heat, with the result that different kittens in a litter may have different fathers.

The morula forms 124 hours after conception. At 148 hours, early blastocysts form. At 10–12 days, implantation occurs. The gestation of queens lasts between 64 and 67 days, with an average of 65 days.

Data on the reproductive capacity of more than 2,300 free-ranging queens were collected during a study between May 1998 and October2000. They had one to six kittens per litter, with an average of three kittens. They produced a mean of 1.4 litters per year, but a maximum of three litters in a year. Of 169 kittens, 127 died before they were six months old due to a trauma caused in most cases by dog attacks and road accidents. The first litter is usually smaller than subsequent litters. Kittens are weaned between six and seven weeks of age. Queens normally reach sexual maturity at 5–10 months, and males at 5–7 months. This varies depending on breed. Kittens reach puberty at the age of 9–10 months.

Cats are ready to go to new homes at about 12 weeks of age, when they are ready to leave their mother. They can be surgically sterilized (spayed or castrated) as early as seven weeks to limit unwanted reproduction. This surgery also prevents undesirable sex-related behavior, such as aggression, territory marking (spraying urine) in males and yowling (calling) in females. Traditionally, this surgery was performed at around six to nine months of age, but it is increasingly being performed before puberty, at about three to six months. In the United States, about 80% of household cats are neutered.

Lifespan and health
The average lifespan of pet cats has risen in recent decades. In the early 1980s, it was about seven years, rising to 9.4 years in 1995  and an average of about 13 years as of 2014 and 2023. Some cats have been reported as surviving into their 30s, with the oldest known cat dying at a verified age of 38.

Neutering increases life expectancy; one study found castrated male cats live twice as long as intact males, while spayed female cats live 62% longer than intact females. Having a cat neutered confers some health benefits, such as a greater life expectancy and a decreased incidence of reproductive neoplasia. However, neutering decreases metabolism and increases food intake, both of which can cause obesity in neutered cats.

Disease
About 250 heritable genetic disorders have been identified in cats; many are similar to human inborn errors of metabolism. The high level of similarity among the metabolism of mammals allows many of these feline diseases to be diagnosed using genetic tests that were originally developed for use in humans, as well as the use of cats as animal models in the study of the human diseases. Diseases affecting domestic cats include acute infections, parasitic infestations, injuries, and chronic diseases such as kidney disease, thyroid disease, and arthritis. Vaccinations are available for many infectious diseases, as are treatments to eliminate parasites such as worms, ticks, and fleas.

Habitats
The domestic cat is a cosmopolitan species and occurs across much of the world. It is adaptable and now present on all continents except Antarctica, and on 118 of the 131 main groups of islands, even on the isolated Kerguelen Islands. Due to its ability to thrive in almost any terrestrial habitat, it is among the world's most invasive species. It lives on small islands with no human inhabitants. Feral cats can live in forests, grasslands, tundra, coastal areas, agricultural land, scrublands, urban areas, and wetlands.

The unwantedness that leads to the domestic cat being treated as an invasive species is twofold. As it is little altered from the wildcat, it can readily interbreed with the wildcat. This hybridization poses a danger to the genetic distinctiveness of some wildcat populations, particularly in Scotland and Hungary, possibly also the Iberian Peninsula, and where protected natural areas are close to human-dominated landscapes, such as Kruger National Park in South Africa. However, its introduction to places where no native felines are present also contributes to the decline of native species.

Ferality
Feral cats are domestic cats that were born in or have reverted to a wild state. They are unfamiliar with and wary of humans and roam freely in urban and rural areas. The numbers of feral cats is not known, but estimates of the United States feral population range from 25 to 60 million. Feral cats may live alone, but most are found in large colonies, which occupy a specific territory and are usually associated with a source of food. Famous feral cat colonies are found in Rome around the Colosseum and Forum Romanum, with cats at some of these sites being fed and given medical attention by volunteers.

Public attitudes toward feral cats vary widely, from seeing them as free-ranging pets to regarding them as vermin.

Impact on wildlife
On islands, birds can contribute as much as 60% of a cat's diet. In nearly all cases, the cat cannot be identified as the sole cause for reducing the numbers of island birds, and in some instances, eradication of cats has caused a "mesopredator release" effect; where the suppression of top carnivores creates an abundance of smaller predators that cause a severe decline in their shared prey. Domestic cats are a contributing factor to the decline of many species, a factor that has ultimately led, in some cases, to extinction. The South Island piopio, Chatham rail, and the New Zealand merganser are a few from a long list, with the most extreme case being the flightless Lyall's wren, which was driven to extinction only a few years after its discovery. One feral cat in New Zealand killed 102 New Zealand lesser short-tailed bats in seven days. In the United States, feral and free-ranging domestic cats kill an estimated 6.3–22.3 billion mammals annually.

In Australia, one study found feral cats to kill 466 million reptiles per year. More than 258 reptile species were identified as being predated by cats. Cats have contributed to the extinction of the Navassa curly-tailed lizard and Chioninia coctei.

Interaction with humans
Cats are common pets throughout the world, and their worldwide population as of 2007 exceeded 500 million. the domestic cat was the second most popular pet in the United States, with 95.6 million cats owned and around 42 million households owning at least one cat. In the United Kingdom, 26% of adults have a cat, with an estimated population of 10.9 million pet cats  there were an estimated 220 million owned and 480 million stray cats in the world.

Cats have been used for millennia to control rodents, notably around grain stores and aboard ships, and both uses extend to the present day. Cats are also used in the international fur trade and leather industries for making coats, hats, blankets, stuffed toys, shoes, gloves, and musical instruments. About 24 cats are needed to make a cat-fur coat. This use has been outlawed in the United States since 2000 and in the European Union (as well as the United Kingdom) since 2007.

Cat pelts have been used for superstitious purposes as part of the practice of witchcraft, and they are still made into blankets in Switzerland as traditional medicines thought to cure rheumatism.

A few attempts to build a cat census have been made over the years, both through associations or national and international organizations (such as that of the Canadian Federation of Humane Societies ) and over the Internet. General estimates for the global population of domestic cats range widely from anywhere between 200 million to 600 million. Walter Chandoha made his career photographing cats after his 1949 images of Loco, a stray cat, were published. He is reported to have photographed 90,000 cats during his career and maintained an archive of 225,000 images that he drew from for publications during his lifetime.

Pet humanization is a form of anthropomorphism in which cats are kept for companionship and treated more like human family members than traditional pets. This trend of pet culture involves providing cats with a higher level of care, attention and often even luxury, similar to the way humans are treated.

Shows
A cat show is a judged event in which the owners of cats compete to win titles in various cat-registering organizations by entering their cats to be judged after a breed standard. It is often required that a cat must be healthy and vaccinated in order to participate in a cat show. Both pedigreed and non-purebred companion ("moggy") cats are admissible, although the rules differ depending on the organization. Competing cats are compared to the applicable breed standard, and assessed for temperament.

Infection
Cats can be infected or infested with viruses, bacteria, fungus, protozoans, arthropods or worms that can transmit diseases to humans. In some cases, the cat exhibits no symptoms of the disease. The same disease can then become evident in a human. The likelihood that a person will become diseased depends on the age and immune status of the person. Humans who have cats living in their home or in close association are more likely to become infected. Others might also acquire infections from cat feces and parasites exiting the cat's body. Some of the infections of most concern include salmonella, cat-scratch disease and toxoplasmosis.

History and mythology
In ancient Egypt, cats were revered, and the goddess Bastet often depicted in cat form, sometimes taking on the war-like aspect of a lioness. The Greek historian Herodotus reported that killing a cat was forbidden, and when a household cat died, the entire family mourned and shaved their eyebrows. Families took their dead cats to the sacred city of Bubastis, where they were embalmed and buried in sacred repositories. Herodotus expressed astonishment at the domestic cats in Egypt, because he had only ever seen wildcats.

Ancient Greeks and Romans kept weasels as pets, which were seen as the ideal rodent-killers. The earliest unmistakable evidence of the Greeks having domestic cats comes from two coins from Magna Graecia dating to the mid-fifth century BC showing Iokastos and Phalanthos, the legendary founders of Rhegion and Taras respectively, playing with their pet cats. The usual ancient Greek word for 'cat' was ailouros, meaning 'thing with the waving tail'. Cats are rarely mentioned in ancient Greek literature. Aristotle remarked in his History of Animals that "female cats are naturally lecherous." The Greeks later syncretized their own goddess Artemis with the Egyptian goddess Bastet, adopting Bastet's associations with cats and ascribing them to Artemis. In Ovid's Metamorphoses, when the deities flee to Egypt and take animal forms, the goddess Diana turns into a cat.

Cats eventually displaced weasels as the pest control of choice because they were more pleasant to have around the house and were more enthusiastic hunters of mice. During the Middle Ages, many of Artemis's associations with cats were grafted onto the Virgin Mary. Cats are often shown in icons of Annunciation and of the Holy Family and, according to Italian folklore, on the same night that Mary gave birth to Jesus, a cat in Bethlehem gave birth to a kitten. Domestic cats were spread throughout much of the rest of the world during the Age of Discovery, as ships' cats were carried on sailing ships to control shipboard rodents and as good-luck charms.

Several ancient religions believed cats are exalted souls, companions or guides for humans, that are all-knowing but mute so they cannot influence decisions made by humans. In Japan, the maneki neko cat is a symbol of good fortune. In Norse mythology, Freyja, the goddess of love, beauty, and fertility, is depicted as riding a chariot drawn by cats. In Jewish legend, the first cat was living in the house of the first man Adam as a pet that got rid of mice. The cat was once partnering with the first dog before the latter broke an oath they had made which resulted in enmity between the descendants of these two animals. It is also written that neither cats nor foxes are represented in the water, while every other animal has an incarnation species in the water. Although no species are sacred in Islam, cats are revered by Muslims. Some Western writers have stated Muhammad had a favorite cat, Muezza. He is reported to have loved cats so much, "he would do without his cloak rather than disturb one that was sleeping on it". The story has no origin in early Muslim writers, and seems to confuse a story of a later Sufi saint, Ahmed ar-Rifa'i, centuries after Muhammad. One of the companions of Muhammad was known as Abu Hurayrah ("father of the kitten"), in reference to his documented affection to cats.

Superstitions and rituals
Many cultures have negative superstitions about cats. An example would be the belief that encountering a black cat ("crossing one's path") leads to bad luck, or that cats are witches' familiars used to augment a witch's powers and skills. The killing of cats in Medieval Ypres, Belgium, is commemorated in the innocuous present-day Kattenstoet (cat parade). In mid-16th century France, cats would allegedly be burnt alive as a form of entertainment, particularly during midsummer festivals. According to Norman Davies, the assembled people "shrieked with laughter as the animals, howling with pain, were singed, roasted, and finally carbonized". The remaining ashes were sometimes taken back home by the people for good luck.

According to a myth in many cultures, cats have multiple lives. In many countries, they are believed to have nine lives, but in Italy, Germany, Greece, Brazil and some Spanish-speaking regions, they are said to have seven lives, while in Arabic traditions, the number of lives is six. An early mention of the myth can be found in John Heywood's The Proverbs of John Heywood (1546): Husband, (quoth she), ye studie, be merrie now, And even as ye thinke now, so come to yow. Nay not so, (quoth he), for my thought to tell right, I thinke how you lay groning, wife, all last night. Husband, a groning horse and a groning wife Never faile their master, (quoth she), for my life. No wife, a woman hath nine lives like a cat.

The myth is attributed to the natural suppleness and swiftness cats exhibit to escape life-threatening situations. Also lending credence to this myth is the fact that falling cats often land on their feet, using an instinctive righting reflex to twist their bodies around. Nonetheless, cats can still be injured or killed by a high fall.

title: Cat


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Talk:Classical liberalism

Rothbard?
Is there really a source that describes Murray N. Rothbard as a classical liberal? 93.45.229.98 (talk) 06:40, 29 September 2023 (UTC)
 * Who else is he? --95.24.66.215 (talk) 03:45, 25 January 2024 (UTC)

Right-libertarianism
What is the difference between CL and right-libertarianism? --95.24.66.215 (talk) 03:45, 25 January 2024 (UTC)

Criticisms
Specifically the Vieira piece. The cited quote is taken out of context. It implies that classic liberalism is incompatible with "democratic" principles.

And yet, reading further down the cited article, we come across this: "We show that, unlike in Amartya Sen’s seminal contribution, classical liberal views of individual autonomy and freedom – as embodied in the harm principle – can provide consistent foundations for collective evaluations, and are consistent with the fundamental democratic principle of unanimity."

Proposed that the section be rewritten to more correctly reflect Vieira's views. Because, TBH, this looks like someone selectively quoted to make their point, while deliberately ignoring the rest of the article. Rumplestiltskin1992 (talk) 04:30, 27 June 2024 (UTC)

title: Talk:Classical liberalism


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Crank

Crank may refer to:

Mechanisms

 * Crank (mechanism), in mechanical engineering, a bent portion of an axle or shaft, or an arm keyed at right angles to the end of a shaft, by which motion is imparted to or received from it
 * Crankset, the component of a bicycle drivetrain that converts the reciprocating motion of the rider's legs into rotational motion
 * Crankshaft, the part of a piston engine which translates reciprocating linear piston motion into rotation
 * Crank machine, a machine used to deliver hard labour in early Victorian prisons in the United Kingdom

Places

 * Crank, Merseyside, a village near Rainford, England
 * Crank Halt railway station in the village of Crank
 * Cranks, Kentucky, United States

Popular culture

 * Crank (film), a 2006 film starring Jason Statham
 * Crank: High Voltage, the 2009 sequel
 * Crank (Hoodoo Gurus album), 1994
 * Crank (novel), a 2004 book written by Ellen Hopkins
 * "Crank" (song), a 1993 song by the alternative rock band Catherine Wheel
 * Crank (The Almighty album), the fourth studio album released by Scottish heavy metal band The Almighty
 * Crank! A Record Company, a record label that released albums by indie bands Mineral, The Gloria Record, and Bright Eyes

Slang

 * Crank (person), a pejorative term used for a person who holds an unshakable belief that most of his or her contemporaries consider to be false.
 * Prank call or crank call, a false telephone call
 * Crank, slang term for powdered substituted amphetamines, especially methamphetamine

Other uses

 * Cranks (restaurant), a chain of English wholefood vegetarian restaurants
 * Crank (surname), a surname, notable people with the surname see there
 * Crank conjecture, a term coined by Freeman Dyson to explain congruence patterns in integer partitions
 * Crank of a partition, of a partition of an integer is a certain integer associated with the partition

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Clade

In biological phylogenetics, a clade, also known as a monophyletic group or natural group, is a grouping of organisms that are monophyletic – that is, composed of a common ancestor and all its lineal descendants – on a phylogenetic tree. In the taxonomical literature, sometimes the Latin form cladus (plural cladi) is used rather than the English form. Clades are the fundamental unit of cladistics, a modern approach to taxonomy adopted by most biological fields.

The common ancestor may be an individual, a population, or a species (extinct or extant). Clades are nested, one in another, as each branch in turn splits into smaller branches. These splits reflect evolutionary history as populations diverged and evolved independently. Clades are termed monophyletic (Greek: "one clan") groups.

Over the last few decades, the cladistic approach has revolutionized biological classification and revealed surprising evolutionary relationships among organisms. Increasingly, taxonomists try to avoid naming taxa that are not clades; that is, taxa that are not monophyletic. Some of the relationships between organisms that the molecular biology arm of cladistics has revealed include that fungi are closer relatives to animals than they are to plants, archaea are now considered different from bacteria, and multicellular organisms may have evolved from archaea.

The term "clade" is also used with a similar meaning in other fields besides biology, such as historical linguistics; see Cladistics § In disciplines other than biology.

Naming and etymology
The term "clade" was coined in 1957 by the biologist Julian Huxley to refer to the result of cladogenesis, the evolutionary splitting of a parent species into two distinct species, a concept Huxley borrowed from Bernhard Rensch.

Many commonly named groups – rodents and insects, for example – are clades because, in each case, the group consists of a common ancestor with all its descendant branches. Rodents, for example, are a branch of mammals that split off after the end of the period when the clade Dinosauria stopped being the dominant terrestrial vertebrates 66 million years ago. The original population and all its descendants are a clade. The rodent clade corresponds to the order Rodentia, and insects to the class Insecta. These clades include smaller clades, such as chipmunk or ant, each of which consists of even smaller clades. The clade "rodent" is in turn included in the mammal, vertebrate and animal clades.

History of nomenclature and taxonomy

The idea of a clade did not exist in pre-Darwinian Linnaean taxonomy, which was based by necessity only on internal or external morphological similarities between organisms. Many of the better known animal groups in Linnaeus's original Systema Naturae (mostly vertebrate groups) do represent clades. The phenomenon of convergent evolution is responsible for many cases of misleading similarities in the morphology of groups that evolved from different lineages.

With the increasing realization in the first half of the 19th century that species had changed and split through the ages, classification increasingly came to be seen as branches on the evolutionary tree of life. The publication of Darwin's theory of evolution in 1859 gave this view increasing weight. In 1876 Thomas Henry Huxley, an early advocate of evolutionary theory, proposed a revised taxonomy based on a concept strongly resembling clades, although the term clade itself would not be coined until 1957 by his grandson, Julian Huxley.

German biologist Emil Hans Willi Hennig (1913–1976) is considered to be the founder of cladistics. He proposed a classification system that represented repeated branchings of the family tree, as opposed to the previous systems, which put organisms on a "ladder", with supposedly more "advanced" organisms at the top.

Taxonomists have increasingly worked to make the taxonomic system reflect evolution. When it comes to naming, this principle is not always compatible with the traditional rank-based nomenclature (in which only taxa associated with a rank can be named) because not enough ranks exist to name a long series of nested clades. For these and other reasons, phylogenetic nomenclature has been developed; it is still controversial.

As an example, see the full current classification of Anas platyrhynchos (the mallard duck) with 40 clades from Eukaryota down by following this Wikispecies link and clicking on "Expand".

The name of a clade is conventionally a plural, where the singular refers to each member individually. A unique exception is the reptile clade Dracohors, which was made by haplology from Latin "draco" and "cohors", i.e. "the dragon cohort"; its form with a suffix added should be e.g. "dracohortian".

Definition

A clade is by definition monophyletic, meaning that it contains one ancestor which can be an organism, a population, or a species and all its descendants. The ancestor can be known or unknown; any and all members of a clade can be extant or extinct.

Clades and phylogenetic trees
The science that tries to reconstruct phylogenetic trees and thus discover clades is called phylogenetics or cladistics, the latter term coined by Ernst Mayr (1965), derived from "clade". The results of phylogenetic/cladistic analyses are tree-shaped diagrams called cladograms; they, and all their branches, are phylogenetic hypotheses.

Three methods of defining clades are featured in phylogenetic nomenclature: node-, stem-, and apomorphy-based (see Phylogenetic nomenclature§Phylogenetic definitions of clade names for detailed definitions).

Terminology
The relationship between clades can be described in several ways:
 * A clade located within a clade is said to be nested within that clade. In the diagram, the hominoid clade, i.e. the apes and humans, is nested within the primate clade.
 * Two clades are sisters if they have an immediate common ancestor. In the diagram, lemurs and lorises are sister clades, while humans and tarsiers are not.
 * A clade A is basal to a clade B if A branches off the lineage leading to B before the first branch leading only to members of B. In the adjacent diagram, the strepsirrhine/prosimian clade, is basal to the hominoids/ape clade. In this example, both Haplorrhine as prosimians should be considered as most basal groupings. It is better to say that the prosimians are the sister group to the rest of the primates. This way one also avoids unintended and misconceived connotations about evolutionary advancement, complexity, diversity and ancestor status, e.g. due to impact of sampling diversity and extinction. Basal clades should not be confused with stem groupings, as the latter is associated with paraphyletic or unresolved groupings.

Age
The age of a clade can be described based on two different reference points, crown age and stem age. The crown age of a clade refers to the age of the most recent common ancestor of all of the species in the clade. The stem age of a clade refers to the time that the ancestral lineage of the clade diverged from its sister clade. A clade's stem age is either the same as or older than its crown age. Note that ages of clades cannot be directly observed. They are inferred, either from stratigraphy of fossils, or from molecular clock estimates.

Viruses
Viruses, and particularly RNA viruses form clades. These are useful in tracking the spread of viral infections. HIV, for example, has clades called subtypes, which vary in geographical prevalence. HIV subtype (clade) B, for example is predominant in Europe, the Americas and Japan, whereas subtype A is more common in east Africa.

title: Clade