Catherine Viot
email: catherine.viot@u-bordeaux.fr

Keywords: Subjective knowledge, consideration set size, consideration set variety, product attributes, perceived risk

Purpose -The purpose of this article is to show that consumers' expertise of a product influences the number of attributes considered as important, the importance given to the attributes as well as the size and the content of the consideration set (CS). Methodology -A quantitative empirical study was carried out with 287 French wine consumers. Findings -The results show that the attributes which were considered as important by the novices differ from those considered important by the experts and that the number of important attributes given by the novices (2) is lower than those given by the experts (7). Furthermore, the results show that the size of the CS itself is also influenced by subjective knowledge. On the other hand, this is not the case for the content of the CS.

Research limitations and implications -

The empirical study only focuses on one product category. The data were collected on the basis of statements rather than observations, which is liable to distort the results. This study shows that the visual attributes such as the design and the packaging are not sufficient to sell wine to French consumers, even if they are novices in this field. Originality -While most research devoted to the effects of the CS focus on a single dimension of it, the empirical study tests simultaneously the effects on the size and on the variety of the CS, which is analysed according to both a qualitative and quantitative approach.

Introduction

The French vine-growing and wine-making sector has been in crisis for several years and it appears obvious today that this crisis is of a structural rather than a conjectural nature. The ways wine is consumed are changing in France where it is losing its characteristic as a drink consumed daily to accompany meals. Since 1980, the proportion of regular consumers (consuming every day or nearly) has steadily decreased, falling from 51% to 17% in 2010. At the same time, the share of occasional consumers has increased by fifteen percentage points and the proportion of non-consumers has doubled, reaching 38% in 20101 . France is gradually moving towards a form of wine consumption which is more occasional as well as being more diversified. This drink is no longer restricted to meals and can be taken as an apéritif, during a moment of relaxation with friends or in the evening as a cocktail like, for example, the kalimotxo, an equal mix of wine and cola, more commonly consumed by young people. Contrary to a generally accepted idea, connoisseurs are not so numerous in France. The knowledge of wine varies between consumers and the moderate level of knowledge which characterizes a majority of consumers is not necessarily due to a falling consumption. Indeed, wine consumption and wine knowledge are not systematically linked. Many of the traditional heavy consumers of wine really didn't know much more than novice consumers. Wine was just a beverage and they consumed local wines which were relatively inexpensive without being interested in learning about wine in general 2 . Recently, [START_REF] Latour | Bridging Aficionados' Perceptual and conceptual knowledge to enhance how they learn from experience[END_REF] describe a specific segment of regular American consumers of wine but whose knowledge remains basic: "The aficionado consumer is one who consumes and enjoys a hedonic product regularly but has failed to obtain product expertise from his/her many experiences » (Latour and Latour, 2010, p. 688). It is therefore necessary today to draw a distinction between the expert consumer -a consumer whose level of knowledge is upper to the average -and one who is a novicewhose level of knowledge is lower than the average. With wine being an extremely complex product which is characterized by a multitude of attributes, it has become vital, for professionals, to identify the choice attributes which are considered important by the expert consumers and by the novice ones so that what is offered is presented in the appropriate way. Furthermore, this deeper knowledge of the attributes favoured by both parties when choosing wine must be considered according to the consumption occasions. Previous research investigates either the effect of subjective knowledge (SK) on the consideration set (Alba andHutchinson, 1987, 2000;[START_REF] Aurier | Consideration set size and familiarity with usage context[END_REF][START_REF] Johnson | Consumer experience and consideration sets for brands and product categories[END_REF][START_REF] Punj | Influence of expertise and purchase intention on the formation of Evoked Sets[END_REF][START_REF] Wirtz | The effects of consumer expertise on evoked set size and service loyalty[END_REF] or the effect of SK on choice attributes [START_REF] Aurier | Assessment of Consumer Knowledge and its Consequences: A Multi-Component Approach[END_REF][START_REF] Dodd | Differential effects of experience, subjective knowledge and objective knowledge on sources of information used in consumer wine purchasing[END_REF][START_REF] Edward | The expert wine taster[END_REF][START_REF] Lockshin | The effect of price and oak flavour on perceived wine quality[END_REF][START_REF] Perrouty | Impact of interaction between brand and region of origin on the perceived value of wine[END_REF][START_REF] Solomon | Psychology of novice and expert wine talk[END_REF]. Thus, we proposed to study the effect of SK and consumption occasions on the consideration set (CS) and choice attributes. To our knowledge, research dedicated to the CS did not examine its contents in detail. Studies focused mainly on the CS size (Alba andHutchinson, 1987, 2000;[START_REF] Aurier | Consideration set size and familiarity with usage context[END_REF][START_REF] Johnson | Consumer experience and consideration sets for brands and product categories[END_REF][START_REF] Punj | Influence of expertise and purchase intention on the formation of Evoked Sets[END_REF][START_REF] Wirtz | The effects of consumer expertise on evoked set size and service loyalty[END_REF]. For that reason, the effects of SK and consumption occasion on the CS will be also analysed at its contents level with a qualitative method. Except [START_REF] Heeler | Attribute importance: contrasting measurements[END_REF], previous studies on choice attributes failed either to compare the importance of a given attribute and its rank in a choice process.

As such, the purpose of this article is to answer two questions: 1) which attributes are considered as important and in which order are they used by consumers when they choose a product, according to both the consumption occasion and their level of SK and 2) what products does the consumer bring to mind for a given choice occasion, according to his/her SK and to the perceived risk? The presentation of the theoretical framework is followed by a conceptual framework and research hypotheses. The methodology is then explained and is followed by the presentation of the results which will be the subject of the discussion at the end of the article.

Background

Subjective knowledge

Product knowledge is part of consumer expertise. Indeed, expertise defined as the possession of a large body of knowledge and procedural skill [START_REF] Chi | Expertise in problem solving[END_REF] is a multidimensional construct comprising familiarity with the product category -which results from accumulated experience with the product and knowledge of the product [START_REF] Alba | Dimensions of Consumer Expertise[END_REF]. It influences the different phases in the decision-making process [START_REF] Bettman | Effect of prior knowledge and experience and phase of choice process on consumer decision processes: a protocol analysis[END_REF][START_REF] Maheswaran | Acquisition and impact of consumer expertise[END_REF][START_REF] Mitchell | The assessment of alternative measures of consumer expertise[END_REF]. Regarding wine, expertise results from knowledge and sensory ability [START_REF] Frøst | Preliminary study of the effect of knowledge and sensory expertise on liking for red wines[END_REF][START_REF] Johnson | A preliminary study of the relationship between Australian wine consumers' wine expertise and their wine purchasing and consumption behavior[END_REF]. But given that in France three of four bottles of wine are bought in hypermarket and supermarket, sensory skills are more rarely used to choose a wine. Knowledge includes a subjective dimension -what consumers think they know -and an objective dimension -what they really know - (Alba and Hutchinson, 2000;[START_REF] Brucks | The effect of product class Knowledge on information search behaviour[END_REF][START_REF] Park | Consumer Knowledge Assessment[END_REF]. SK has been shown to be a stronger motivation of purchase-related behavior than objective knowledge [START_REF] Selnes | Subjective and objective measures of product knowledge contrasted[END_REF]. There is no significant difference in the impact of objective knowledge and SK on the width and depth of information search and information processing [START_REF] Mishra | How mutual fund investors 'objective and subjective knowledge impacts their information search and processing behavior[END_REF]. SK has been reported through empirical testing to be more important to the definition of knowledge because it influences the consumer's perception of their ability to process information [START_REF] Moorman | Subjective knowledge, search locations, and consumer choice[END_REF]. A meta-analysis of 51 empirical findings associated with the relationship between objective knowledge and SK provides further evidence that objective and SK are significantly -although moderately -positively related (r = 0.37) and that this correlation is stronger for products (r = 0.57) versus non products (r = 0.32) [START_REF] Carlson | Objective and Subjective Knowledge Relationships: A Quantitative Analysis of Consumer Research Findings[END_REF]. In the same meta-analysis, this correlation is estimated at 0.42 for experience goods. Now, wine can be considered as an experience good that must be consumed before consumers learn about quality. Moreover, according to [START_REF] Perrouty | The influence of wine attributes on region of origin equity: An analysis of the moderating effect of consumer's perceived expertise[END_REF], SK is a key determinant of wine consumers' behavior and an appropriate basis for determining whether consumers are wine experts or novices. According to these findings, this research will focus on the subjective dimension of the consumer knowledge. Thus, throughout this article, the expert consumer is one who perceived itself as a knowledgeable consumer compare to other consumers. He differs from experts described by [START_REF] Parr | Demystifying wine expertise: olfactory threshold, perceptual skill and semantic memory in expert and novice wine judges[END_REF] for whom experts in wine are established winemakers, wine science researchers and teaching staff regularly involved in winemaking and/or wine evaluation, wine professionals (wine judges, wine writers, wine retailers), graduate students in viticulture and oenology who had relevant professional experience, or persons with extensive (> 10 years) history of wine involvement (i.e. family history, extensive wine cellar, regular involvement in formal wine tasting).

Consumption occasions and consideration set

The CS is defined as the set of brands brought to mind on a particular choice occasion [START_REF] Nedungadi | Recall and consumer consideration sets: influencing choice without altering brand evaluation[END_REF]. The CS has been shown to influence buying behaviour [START_REF] Shoker | Consideration set influences on consumer decision making and choice: issues, models and suggestions[END_REF][START_REF] Kardes | Brand retrieval, consideration set composition, consumer choice, and the pionnering advantage[END_REF]. Indeed, when a product is consumed frequently, the consumer tends to memorize a stable CS associated with different consumption occasions [START_REF] Barsalou | Ad hoc Categories[END_REF]. The CS is characterized by several dimensions: its size, (the number of alternatives considered) and its variety, which refers to the degree of distinction between the products present in the CS (Desai and Hoyer, 2000). Wine can be consumed in different occasions (eating with friends / with family, intimate dinner, celebration, drink by self, etc.). It has been shown that choosing wine is an occasion-based behaviour [START_REF] Aurifeille | Investigating situational effects in wine consumption: a means-end approach[END_REF][START_REF] Quester | The influence of consumption situation and product involvement over consumers'use of product attributes[END_REF].

Perceived risk

The level of risk perceived by the consumer towards the product affects his/her buying decision (Dowling, 1999). Roselius (1971) and [START_REF] Jacoby | The components of perceived risk[END_REF] identified six categories of risk: the functional risk (a fault which makes the product unfit for consumption) ; the financial risk (will the consumer obtain good value for money ?) ; the physical risk (a product which is perceived as harmful to the health) ; the psychological risk (the risk that the consumer will have low self-esteem if (s)he buys a product which will not provide satisfaction) ; the social risk (the risk that third parties -friends, acquaintances or family -will judge the buyer poorly if (s)he has made a bad choice) and the risk of loss of time (time spent evaluating the alternatives). When they perceive a high level of risk, consumers deploy risk reduction strategies [START_REF] Dowling | A model of perceived risk and intended risk-handling activity[END_REF]. Perceived risk is a key determinant of wine choice. For example, perceived risk influences the use of extrinsic cues, such as price and expert opinion [START_REF] Aqueveque | Extrinsic cues and perceived risk: the influence of consumption situation[END_REF] and the preference for traditional products [START_REF] Campbell | The moderating effect of perceived risk on consumers' evaluations of product incongruity: preference for the norm[END_REF]. Extrinsic cues like reputation, advice from staff and previous consumption of the wine are found to be risk-reduction strategies [START_REF] Lacey | The role of perceived risk in wine purchase decisions in restaurants[END_REF].

Conceptual framework and research hypotheses

Effect of subjective knowledge on the importance of the attributes

A product, whatever it is, is defined by a set of intrinsic and extrinsic attributes. Intrinsic cues are those that form any physical part of the product and cannot be altered without changing product performance or technical specifications; alternatively, extrinsic cues are any aspects only associated with the product [START_REF] Aaron | The influence of attitudes, beliefs and label information on perceptions of reduced-fat spread[END_REF]. Brand name, label attractiveness, design of the bottle, origin and price are good examples of extrinsic attributes of wine whereas organoleptic qualities are intrinsic cues. Numerous products are put on the market in conditions where the consumer does not have the possibility to test them before buying. This is the case for food products sold by large retailers. For these products, the consumer therefore has to rely on extrinsic attributes to evaluate, a priori, their quality. Wine is one of these products. The choice would be much simpler if consumers could taste the wine and appreciate its organoleptic qualities. As in the majority of cases, the consumer does not have this possibility, (s)he must rely on information which is available such as the price, the region of production, the vintage, the packaging, the brand name, recommendations etc. Wine is a product which is characterized by multiple extrinsic attributes. For example, d'Hauteville and [START_REF] 'hauteville | Understand the consumer of wine[END_REF] identify eight extrinsic attributes considered as wine quality indicators: region of production, brand name, AOC (Appellation d'Origine Contrôlée) label, "vin de pays" (local wine) label, medal/award, grape variety, person who bottled the wine and alcoholic content. According to [START_REF] Quester | The influence of consumption situation and product involvement over consumers'use of product attributes[END_REF], wine is a combination of 13 attributes among which appear the fermentation, the label, the back-label and the style of the wine. [START_REF] Cohen | Applying best-worst scaling to wine marketing[END_REF] suggests 11 attributes like recommendations, brand name, food/wine harmony and country of origin. [START_REF] Verdu Jover | Measuring perceptions of quality in food products: the case of red wine[END_REF] develop a measurement scale including 21 items grouped into seven factors : origin (brand name, region, appellations, etc.) ; image (image of the wine, opinion of friends, the press, experts, wine waiters etc.) ; presentation (bottle, label, etc.) ; age ; year of production and, finally, two dimensions relating to extrinsic cues (organoleptic qualities). A few studies focused on the influence of the expertise on the consumer's choice process [START_REF] Aurier | Assessment of Consumer Knowledge and its Consequences: A Multi-Component Approach[END_REF][START_REF] Dodd | Differential effects of experience, subjective knowledge and objective knowledge on sources of information used in consumer wine purchasing[END_REF][START_REF] Edward | The expert wine taster[END_REF][START_REF] Lockshin | The effect of price and oak flavour on perceived wine quality[END_REF][START_REF] Perrouty | Impact of interaction between brand and region of origin on the perceived value of wine[END_REF][START_REF] Solomon | Psychology of novice and expert wine talk[END_REF]. [START_REF] Aurier | Assessment of Consumer Knowledge and its Consequences: A Multi-Component Approach[END_REF] investigated the impact of knowledge on the ability to memorize attributes and on the importance given to attributes. As product knowledge improves, consumers use more and more attributes to make their choice, which leads us to hypothesis H1. H1. Consumers with a higher SK level consider a higher number of attributes important than consumers with a lower SK level do in their buying decision.

Researchers have found that experts and novices differ in the content and organization of their knowledge and as a result exhibit large variances when they perform some product-related tasks [START_REF] Aurier | Assessment of Consumer Knowledge and its Consequences: A Multi-Component Approach[END_REF]. More knowledgeable consumers rely more on functional, intrinsic and less on perceptual attributes. On the contrary, less knowledgeable individuals are more likely to rely on schema-based inferences [START_REF] Alba | Dimensions of Consumer Expertise[END_REF]. For example, [START_REF] Aurier | Assessment of Consumer Knowledge and its Consequences: A Multi-Component Approach[END_REF] identify three a priori « novice » attributes -colour, price and bottle design -and seven a priori "expert" attributes -AOC, region of production, estate name, "Bottled at the estate", year, "Aged in oak barrel" and perceived quality. This leads us to hypothesis H2: H2. Consumers with a higher SK level and consumers with a lower SK level do not consider the same product attributes as important in their buying decision.

The order in which the attributes are considered differs between expert consumers and novice consumers. Indeed, according to a European study, experts first consider the origin (region of production) then the combined brand*region effect whilst novices favour price and then the region - [START_REF] Perrouty | Impact of interaction between brand and region of origin on the perceived value of wine[END_REF]. We can therefore formulate hypothesis H3: H3. Consumers with a higher SK level and consumers with a lower SK level do not use product attributes in the same order during the buying process.

Effects of subjective knowledge on the consideration set

The impact of SK on the CS has already been studied [START_REF] Aurier | Consideration set size and familiarity with usage context[END_REF][START_REF] Johnson | Consumer experience and consideration sets for brands and product categories[END_REF]. Previous research has focused principally on the size of the CS (Alba andHutchinson, 1987, 2000;[START_REF] Johnson | Consumer experience and consideration sets for brands and product categories[END_REF][START_REF] Punj | Influence of expertise and purchase intention on the formation of Evoked Sets[END_REF][START_REF] Wirtz | The effects of consumer expertise on evoked set size and service loyalty[END_REF]. Some of these studies validate the existence of a link between the consumer's experience and the size of the CS. As the knowledge of the product improves, the consumer considers a higher number of alternatives [START_REF] Aurier | Consideration set size and familiarity with usage context[END_REF], which leads us to hypothesis H4: H4. The size of the CS is bigger for consumers with a higher SK level than for consumers with a lower SK level.

The variety of the CS or "how distinct products within the set are" is influenced by memorization and particularly by the way in which the consumer categorizes the product in his/her mind (Desay and Hoyer, 2000). While for a classical product the categorization is very often organized around brands, this pattern appears less appropriate to explain the categorization of wines in the minds of French consumers [START_REF] Viot | Wine brands or branded wines[END_REF]. For the latter, it seems that geographical origin serves as the basis for categorizing wines. The "region of production" geographical criterion is considered the most important attribute for a majority of French consumers (d'Hauteville and Sirieix, 2007). In this market, the appellation plays the role of the brand [START_REF] Viot | Wine brands or branded wines[END_REF]. The importance given to the origin is not specific to France. Spanish consumers have developed a genuine involvement for appellations in the same way as they would for a brand [START_REF] Rodriguez-Santos | Segmenting consumers according to their involvement with appellations of origin[END_REF]. American consumers also use geographical indications -country and region -as an indicator of quality, but the appellation appears secondary [START_REF] Atkin | Appellation as an indicator of quality[END_REF]. This is the reason why we propose to study the impact of SK on the variety of the CS, taking into account the origin of the wine, leading us to hypothesis H5: H5. The content of the CS, in terms of structure and variety, is influenced by SK:

Consumption occasions, subjective knowledge and perceived risk

The purchase of wine can be considered as a risky purchase because of the diversity of the product offering. It has been shown that in a food consumption context, SK influences the perceived risk [START_REF] Sweeney | The effect of knowledge types on consumer perceived-risk and adoption of genetically modified food[END_REF]. Several scholars suggest that the level of perceived risk varies according to the consumption occasions [START_REF] Aurier | Consideration set size and familiarity with usage context[END_REF]Quester and Smart, 1999). We therefore formulate hypothesis H6: H6. Consumers with a lower SK level perceive a higher risk than that of consumers with a higher SK level across all wine consumption occasions.

In the case of high perceived risk, the consumer displays a preference for the norm or for a product which is familiar to him/her [START_REF] Campbell | The moderating effect of perceived risk on consumers' evaluations of product incongruity: preference for the norm[END_REF]. Evaluation of products is based on the discrepancy between product attributes and consumers' expectations for this type of product. Under high-risk conditions, congruent products are preferred to the moderately incongruent products. [START_REF] Campbell | The moderating effect of perceived risk on consumers' evaluations of product incongruity: preference for the norm[END_REF] describe this behavior as the consumers' preferences for the norm, which in the context of wine can result in a propensity to choose certain AOC or certain regions benefiting from a good reputation. In accordance with Popper's refutability principle [START_REF] Popper | Objective Knowledge: an evolutionary approach[END_REF], we will not formulate a hypothesis in the strict sense of the term but rather a research proposition, given that the content of the CS will be studied through a qualitative content analysis which makes the refutation of this allegation difficult.

P7.

The perceived risk associated with each consumption occasion influences the variety of the CS.

Figure I Research model and hypothesis

Methodology

The data were collected from a convenience general population sample comprising French consumers aged from 19 to 87 years (n=300; average age =40.7 years). The respondents (52 % men) had made at least one purchase during the last three months. The questionnaire was completed face to face. 287 correctly-completed questionnaires were analyzed. This sample is comparable in terms of size and characteristics to those used in numerous recent wine marketing researches [START_REF] Agnoli | Generation Y's perception of wine and consumption situations in a traditional wine-producing region[END_REF][START_REF] Concha | Contingent consumer decision making in the wine industry: the role of hedonic orientation[END_REF][START_REF] Espejel | Wine marketing strategies in Spain: a structural equation approach to consumer response to protected designations of origin (PDO)[END_REF][START_REF] Latour | Bridging Aficionados' Perceptual and conceptual knowledge to enhance how they learn from experience[END_REF][START_REF] Orth | Store-evoked affect, personalities and consumers emotional attachments to brands[END_REF][START_REF] St James | Factors influencing wine consumption in Southern California consumers[END_REF]Veale and Quester, 2009, etc.).

In the first part of the questionnaire, focusing on the choice of the wine, the respondents had to recall the circumstances of their last purchase: specify its purpose choosing from six propositions and indicate the importance given to 30 attributes describing the wine. The consumption occasions were determined from the literature [START_REF] Aurier | Consideration set size and familiarity with usage context[END_REF][START_REF] Aurifeille | Investigating situational effects in wine consumption: a means-end approach[END_REF][START_REF] Quester | The influence of consumption situation and product involvement over consumers'use of product attributes[END_REF][START_REF] Rodriguez-Santos | Segmenting consumers according to their involvement with appellations of origin[END_REF]. Based upon this literature, six scenarii were developed (the percentages between brackets indicate the frequencies observed in our sample). S1. For a gift (13.6). S2. For a festive meal, a special event (Christmas, birthday, Valentine's day etc.) (7.3).

S3

. For a meal at home with friends (35.9). S4. For a meal at friends' home (13.9). S5. For your usual consumption (24.4). S6. For a barbecue with friends (1.7). These situations cover 96.8 % of the circumstances of the last purchase. They are therefore realistic scenarii. The data collection period -end October/ beginning November -was not very promising for barbecues which explains the low frequency. The importance given to each attribute is evaluated on a scale from 1 (no importance) to 4 (very important). The respondents were invited to answer according to the last wine purchase they made. A list of 30 attributes (Appendix I) was drawn up based upon previous research [START_REF] Aurier | Assessment of Consumer Knowledge and its Consequences: A Multi-Component Approach[END_REF]d'Hauteville and Sirieix, 2007;Orth and Krska, 2001;[START_REF] Quester | The influence of consumption situation and product involvement over consumers'use of product attributes[END_REF][START_REF] Verdu Jover | Measuring perceptions of quality in food products: the case of red wine[END_REF] and from a pilot study carried out with 35 consumers and professionals. The respondents then had to indicate in which order they used the three attributes considered as indispensable during the last purchase. This type of measurement has already been used by [START_REF] Aurier | Assessment of Consumer Knowledge and its Consequences: A Multi-Component Approach[END_REF]. The respondents had to evaluate the perceived risk associated with each consumption occasion. To measure this dimension of risk, ad hoc mono-item scales are generally used [START_REF] Celhay | Design du packaging, appreciation esthétique et intention d'achat : l'impact du jugement d'atypicalité. Une application au cas des vins de Bordeaux[END_REF][START_REF] Celhay | Wine labelling: is It time to break with tradition? A study of the moderating role of perceived risk[END_REF] whereas multi-items scales were developed to measure the risk associated with the purchase of a product (Stone and Gronhaug, 1993). In line with this literature, the level of risk associated with consumption occasions is measured on a mono item-scale developed specifically for the study: "what is the level of risk that you associate with this purchase?" (from 1 = weak to 4 = strong). The second part of the questionnaire focused on the CS. In this study, the CS is characterized by two dimensions: the variety and the size. Regarding the variety (structure and content of the CS), the respondents had first to indicate which wine from three possible wine origins (Bordeaux wines/wines from another French region/foreign wines) they considered buying for each of the scenarii given. Multiple answers were allowed: for a given situation, respondents could consider to choose a Bordeaux wine but also a wine from another French region and a foreign wine. Next, the subjects had to indicate precisely, for each origin chosen, one or several wines they considered buying. The answer format for this question was free so that respondents could indicate exact regions, brand names, AOC, colors, countries… They were not limited in length (Appendix II). For a given consumer, the size of the CS was measured by the number of wines (s)he proposed to buy. An average was calculated distinguishing expert consumers from novice consumers for each choice occasion. The third part of the questionnaire concerned the profile of the respondent in sociodemographic terms and in terms of SK. Respondents expressed their knowledge through four items reflecting a general feeling of knowledge, expertise in comparison to others and familiarity with wine.This four-item scale is inspired from Flynn and Goldsmith's scale (1999), a five-item scale consisting of both positively and negatively worded items that was found to be a valid and reliable measure of SK across a range of product categories. The French adaptation of this scale [START_REF] Korchia | The Effects of Brand Associations on Three Constructs[END_REF], had already been used to measure wine SK [START_REF] Viot | Wine brands or branded wines[END_REF]. A Principal Components Analysis confirms the unidimensionality of SK (Appendix III). An average score, calculated from these four items, enabled the level of SK to be determined and the expert and novice consumers to be identified. The average level of SK is 2.498 out of 4 with a standard deviation of .6. Three groups of consumers were established. The first group brings together the 93 expert consumers with a level of SK higher than 2.8 (average + ½ standard deviation). An expert population of approximately one third of the sample could seem to be large but this large proportion can be explained by the use of a subjective measure of knowledge. Respondents could see themselves as more knowledgeable than they actually are. The second group comprises the 87 novice consumers whose knowledge level is below 2.2 (average -½ standard deviation). Finally, the third group is composed of consumers with a moderate level of knowledge (n=112). This moderate group is often overlooked in studies as people in this segment don't show a lot of differences. For this reason, respondents whose level of SK was close to the average (2.498) and\or to the median (2.5) were excluded from analyses.

Results

Effects of subjective knowledge on the attributes

For the novice consumers, only two attributes out of the 30 were considered as somewhat important or very important. They were the price and the vintage. For the experts, seven attributes were considered as somewhat or very important (vintage, region, terroir, age, AOC, "Bottled at the estate/at the château", country of origin, medals/awards, château name and price. The number of attributes considered as important by the expert consumers is higher than for the novices (Table I). As such, hypothesis H1 can be considered as validated. A comparison test shows that the differences between knowledgeable consumers and novice consumers are statistically significant for 17 attributes out of 30 (Appendix I). Among these 17 attributes, 13 are considered more important by the expert consumers and four are considered more important by the novice consumers (Table II). As such, hypothesis H2 can be considered as validated. The importance given to the attributes differs between consumers with a high level of SK and those with a low level even though it does not concern all the attributes. In order to check for a possible effect of the choice occasion on the importance given to the attributes, a one-way Manova was carried out. The observations corresponding to the barbecue with friends were excluded from the analysis because of their low number. The results show the absence of effect of the consumption occasion on the importance given to the attributes (p >.05).

After having evaluated the importance of each attribute, the respondents had to rank the three attributes considered indispensable during the last purchase. The three essential criteria are markedly different for the experts and the novices. (Table III). Only the indication concerning the vintage appears to show similarity. This attribute is ranked second for both sorts of consumers. While the price is foremost in the buying decision of the novices, the expert consumers consider first the attributes giving information on the origin (château, region of production). A Mann-Whitney test confirms that at least one of the attributes which feature in Table III is ranked differently by the experts and the novices. It is the price, whose rank is higher for the novices than for the experts (Z = -2.307, p< .05). As such, hypothesis H3 can be considered as validated The number in brackets indicates the percentage of respondents having ranked this attribute first, second or third.

The non bolded attribute in each line represents the attribute ranked as first, second or third attribute by a less important percentage of respondents. For example, when they have to classify only three attributes which they consider as indispensable during a purchase process, 23% of the consumers whose level of knowledge is low, rank the price as the first attribute, while for 18.4% of them, the Château name is the first attribute. In the same way, 19.5% of them rank the vintage as the second attribute, while for 11.5 % this is the price. And finally, for 17.2% of novice consumers, the price is ranked as the third attribute whereas for 13.8% of them, this is the Château name.

Although no hypothesis has been formulated on this subject, we then checked if a higher degree of importance given to an attribute of wine means that this attribute is considered as a priority during a buying process. It appears that this is not systematically the case (Table IV). While for the expert consumers the vintage is the attribute considered as the most important (with a score of 3.68/4), it only ranks second in the choice sequence based on three attributes. The age of the wine does not appear in this sequence of three attributes although it is considered as the third most important attribute (3.62/4). Moreover, the château name, ranked first in the sequence of three attributes, is the 8 th attribute in terms of importance. For the novice consumers, it seems that the order reflects more the importance of the attributes. This is the case for the price and the vintage.

Effects of subjective knowledge on the consideration set

For this part of the analysis, five scenarii out of the six originally proposed, have been retained (S1, S2, S4, S5 and S6). Only one scenario concerning a meal with friends is maintained. The respondents had to answer for all five scenarii, in contrast to the previous analyses.

Consideration set size. The products evoked by each consumer were counted in order to define the average size of the CS. This analysis was made scenario by scenario. Then the average number of products in the CS was used to make a comparison between the expert consumers and the novices (Table V). The CS size (2.258 products at most for consumers with a higher level of SK) is relatively low compared to other products (from 1.3 for toothpastes to 5.4 for soft drinks, Roberts; 1989). The differences in size are always as expected: the CS of the expert consumers is higher than that of the novice consumers. A t-test shows that these differences are significant for four scenarii out of five. The size of the CS does not differ in a significant way between consumers with a high level of SK and those with a low level of SK when it is a question of buying a bottle of wine for a festive meal or other special occasion. Hypothesis H4 can therefore be considered as supported.

Variety of the CS. Bordeaux wines are overwhelmingly popular in scenarii S1, S2 and S4 for both the expert consumers and the novices (Table VI). For scenario S5 (usual consumption), the expert consumers have a lower propensity than the novices for choosing a Bordeaux wine even if Bordeaux is their first choice. For scenario S6, the experts very heavily favour wines from another region of France (Figure II). The differences are not as marked as we would have expected. The choice between wines from Bordeaux, from other regions and foreign wines does not seem to be influenced by the level of SK, except for scenario S6.

Figure II Consideration set content

In order to refine this analysis, a comparison test of proportions was carried out. Differences in proportion between the experts and the novices having chosen a wine from Bordeaux, another French wine or a foreign one are in fact rarely significant (Table VI). Only five differences out of the 15 are statistically significant (p <.05). The effect of SK on the structure of the CS is more marked for scenarii S1 (purchase of a wine for a gift) and S5 (purchase for usual consumption). Hypothesis H5, postulating that the content of the CS, in terms of structure and variety, varies according to SK cannot be considered as validated.

In order to complete these results, a thematic content analysis was carried out. In total, the 87 novices and 93 experts made 1456 statements. These were classified into the following categories: AOC -regions, châteaux names, countries and brands. These categories enable 96% of the statements to be classified. The AOC and the regional appellations are the most frequent (72 %), far ahead of the countries for the foreign wines (16 %), the châteaux (5 %), the brands (3 %) and miscellaneous statements covering essentially grape varieties and the colour of the wine (Figure III)

Figure III Breakdown of statements

It can also be highlighted that the expert consumers mentioned AOC, countries and châteaux names more than the novice while, for brands, the novices' statements are nearly equal to those of the expert consumers.

Figure IV Breakdown of statements according to the level of subjective knowledge

It appears that the variety of the CS differs according to SK (except for brands).

Effects of subjective knowledge on the perceived risk

Hypothesis H6 postulates that the novices' level of perceived risk is higher than that of the expert consumers. Although the average level of risk perceived by the novices is indeed higher than that of the expert consumers, for each of the five scenarii, a t-test shows that this difference is statistically significant for only one scenario: the purchase of a wine for a gift (S1), ( Therefore, the level of SK does not have an effect on the perceived risk associated with each scenario; hypothesis H6 cannot be validated. This counterintuitive result is discussed further.

In order to check if the level of perceived risk influences the content of the CS, a preliminary analysis is necessary. A one way Anova and a post hoc multiple comparisons of averages test were carried out in order to check if the average level of risk associated with each consumption occasion differs from each other, without distinguishing between expert consumers and novices, since the previous test suggests there is no justification in making a distinction. The perceived risk differs in fact according to the scenario (Table VIII). The Levene test confirms the homogeneity of the variances hypothesis (Levene = 3.563; p < .01) and the inter-group variance is statistically significant (F = 5.761; p < .001). The F-test is significant but additional exploration of the differences among means is needed to provide specific information on which means are significantly different from each other. In the case of a small number of experimental groups, the Bonferroni's test turns out interesting because it limits the increase of the α risk due to the multiplication of pair-wise comparisons.

According to the Bonferroni's test, the differences between S1 and S2, S1 and S6, S1 and S5 and finally S2 and S5 are significant (Table IX). Given these results, the consumption occasions can thereby be classified from the least risky to the most risky: purchase for one's usual consumption S5 < purchase for a barbecue with friends S6 < purchase for a festive meal or other special event S2 < purchase for a gift S1. Thus, choosing a wine for a gift is perceived as the most risky situation. A purchase for a meal with friends has not been retained for the following analyses since the differences of perceived risk with the other consumption occasions are never significant. The analysis of the content was then continued in order to display the elements which are favourable to the P7 research proposition which postulates that the perceived risk has an effect on the content of the CS. For this phase, we have only retained the four scenarii presenting the levels of risk perceived as different (S1, S2, S5 and S6). The objective of this analysis is to check whether certain AOC-regions, brands or countries are more closely associated with certain levels of perceived risk. For this analysis, we do not draw a distinction between the expert consumers and the novice consumers because they perceive relatively close risk levels. The analysis of the content effectively enables us to identify specific wines according to the risk associated with the consumption occasions (Appendix IV).

For the high risks, (S1 and S2), the prestigious AOC Bordeaux wines are frequently mentioned (Saint Emilion, Sauternes, Pomerol) as well as other prestigious wine regions in France (wines from Burgundy or Champagne). Certain very prestigious châteaux (Château Margaux, for example) are also mentioned. Among foreign wines, we can note the presence of prestigious brand names such as Opus One (California), considered by the professional French experts as being worthy of comparison with the great Bordeaux wines.

For the consumption occasions perceived as less risky (S5 and S6), the less prestigious AOC are considered (Bordeaux and Bordeaux Supérieurs, Côtes de Bordeaux). Other regions of France are also favoured: Loire and Provence for rosé wines, and Côtes du Rhône for red wines. A few brand names are equally associated with these consumption occasions. Some are French (Baron de Lestac, Clairet de Quinsac), others are foreign such as Marques de Caseres (Spain).

Finally, certain wines seem to be appropriate, whatever the level of perceived risk. These are Médoc and Pessac-Léognan AOC wines, wines from Alsace, branded wines (Tariquet, for example which is a very fruity white wine produced in the Armagnac region) and most foreign wines. Indeed, we can underline the fact that if French consumers seem to be more open to foreign wines, they do not make a marked distinction according to the consumption occasions. Spanish wines and particularly those from the Rioja region, wines from Italy, from South America (Argentina and Chile) and from Australia are considered whatever the level of perceived risk.

Discussion and conclusion

Discussion of results

The expert consumers consider a higher number of attributes as important compared to the novices. This result is confirmed in the literature. Aurier and N'Gobo (1999) had, for example, identified three a priori novice attributes against seven a priori expert attributes.

The most important attributes are not the same for the experts and the novices. The attributes which are specific to expert consumers are, in decreasing order of importance, the vintage, the region, the terroir, the age, the AOC, the wording "Bottled at the estate/at the château", the country of origin, the official rankings, the château name and the price, while for novices, they are the price and the vintage. These results confirm in part the previous literature.

According to [START_REF] Aurier | Assessment of Consumer Knowledge and its Consequences: A Multi-Component Approach[END_REF], the expert consumers give importance to the following attributes: AOC, region of production, estate name, "Bottled at the estate", vintage, "Aged in oak barrels" and perceived quality. There is therefore a certain conformity. For the novice consumers on the other hand, our results show that they favour above all the price and the vintage while according to [START_REF] Aurier | Assessment of Consumer Knowledge and its Consequences: A Multi-Component Approach[END_REF], they give importance to the colour, the price and the design of the bottle. More recent researches show that consumers, whether novice or not, show a preference for wines with classic packaging (Campbell and Goldstein, 2001;[START_REF] Celhay | Wine labelling: is It time to break with tradition? A study of the moderating role of perceived risk[END_REF]. During the last decade, numerous wines with an innovative packaging were launched on the French market. These bad experiences can explain distrust towards this type of packaging and, as an indirect result, a lesser importance attached to this attribute. When comparing the attributes where the importance diverges, to a significant extent, it can be noted that the novice consumers attach more importance to the physical and promotional criteria than the expert consumers while the expert consumers attach more value to the origin of the wine and the conditions in which it has been matured than the novices do. The fact that the expert consumers give more importance to the colour than the novices goes against the conclusions made by [START_REF] Aurier | Assessment of Consumer Knowledge and its Consequences: A Multi-Component Approach[END_REF]. Although there is no evidence of this, it could be suggested that the term "colour" without further explanation could have been interpreted differently by the novice consumers (white, red, rosé) and by the expert consumers who perhaps perceived this attribute as the "hue" of the wine (from vermilion red to dark violet for the red wines and from straw yellow to lemon going for the whites).

In the middle of the 2000s decade, varietal wines and branded wines were presented as possible solutions to attract young French consumers considered as novices. However, the grape variety and the brand name do not feature among the important attributes (importance of 2.28/4 and 2.32/4). Moreover, the grape variety and brand name are considered more important for the expert consumers (2.96/4 and 2.41/4). This result contradicts the generally accepted idea according to which grape variety wines are appreciated by the novice consumers. The consumption of varietal wines increases regularly in France (+ 12 % in volume compare to 2009) and they represent 17 % of sales in volume (12 % in value) 3 . But this success is partially due to their low price (an average price of 2.51 €/bottle, against 3.66 in general).

Consumers with a high or low level of SK seem to agree on the least important attributes: information relating to eco-friendly wines: organic wine and environmentally-friendly wine (Appendix I). We must not come to a hasty conclusion regarding the lack of enthusiasm that the French have for this type of wine. The French have long considered wine as a natural product. However, some recent studies highlighting the presence of traces of pesticides and fertilizers in wine have somewhat undermined these convictions. In 2009, 67 % of French consumers agree with the idea that traces of pesticides, fertilizers and fungicides can be found in the wine they consume (against 41 % in 1998) 4 .

When respondents indicate in which order they use the three attributes considered as indispensable during the last purchase, this order differs between the expert consumers (château name, vintage and price) and novices (price, vintage and château name). This result corroborates and completes Perrouty's European study concluding that, the expert consumers use 1) a combination of the brand*region attributes, 2) the region, 3) the name of bottler, 4) the price and 5) a combination of the region*price attributes... whereas novice consumers use 1) the price, 2) the region, 3) the name of bottler, 4) a combination of the region*grape variety attributes and 5) the brand name [START_REF] Perrouty | Impact of interaction between brand and region of origin on the perceived value of wine[END_REF]. According to our results, the vintage that wasn't included in Perrouty's study seems to be an important choice attribute.

The results appear to contradict the existence of a perfect correspondence between importance and order of attributes, in particular for the expert consumers. To our knowledge, the relationship between importance and order of use of the attributes has been studied little in the literature [START_REF] Heeler | Attribute importance: contrasting measurements[END_REF]. It seems, however, to present an interest from a methodological point of view: can we solely measure the importance that the consumer associates with each attribute in a buying process, or should we also take account of the order in which the attributes are considered in the decision-making process? Our results show the interest of launching new investigations with research methods allowing the recording of choice sequences. Some methods are well suited:

-the protocols method where the respondent is invited to describe, aloud, his/her reasoning while (s)he chooses a product; -information display board (IDB) method, developed to examine the depth, content, and sequence of information acquired by consumers in making a marketplace choice.

With IDB method, subjects choose information piece by piece from an attribute by product matrix board until they have acquired enough information to make a product selection. The complete information acquisition behavior of the subject can be followed through the IDB. "In addition, the instrument has the advantage of allowing subjects to choose for themselves the attributes warranting attention", [START_REF] Heeler | Attribute importance: contrasting measurements[END_REF]. This method is now rejuvenated thanks to Internet [START_REF] Petr | La méthode des tables d'information : un renouvellement grâce à Internet[END_REF]. The size of the experts' CS is bigger than the novices'. This result confirms those already observed in the literature [START_REF] Aurier | Consideration set size and familiarity with usage context[END_REF]. On the other hand, SK has a very slight influence on the structure of the CS. Only scenario S6 shows a very different structure. In this situation, the expert consumers favour wine from another region while the novices prefer Bordeaux.

The weight of the AOC and the regions (72 % of the statements) suggest that the knowledge of wine is based upon a categorization according to the origin and not the brand (3 % of the statements). This result corresponds to the literature [START_REF] Viot | Wine brands or branded wines[END_REF]. The brands and the grape varieties have a low presence in the CS both for the expert consumers and the novices, which is coherent with the fact that these attributes are not among the most important ones.

The level of SK does not have an effect on the risk associated with each scenario, especially as the level of perceived risk is low. For the five scenarii, the level of risk is perceived as low or moderate. This result is not apparently due to the choice of scenarii since a one way Anova showed that the level of perceived risk differs, except for the purchase of a wine for a meal with friends (Table VII). A possible explanation is the low variance within the sample in terms of SK.

For the most risky situations, the consumer falls back on certain regions of production (Bordeaux, Burgundy and Champagne) or certain renowned AOC (Saint Emilion, Médoc and Pomerol). The consumers' trust is therefore principally founded on the region or the AOC, which conforms to the literature (Sirieix and Morot, 2001). They consider that they provide an adequate guarantee. That can also be explained by what [START_REF] Campbell | The moderating effect of perceived risk on consumers' evaluations of product incongruity: preference for the norm[END_REF] describe as the consumers' preferences for the norm. Certain AOC appear to constitute a reference and play the role of the typical product for certain consumption occasions (Côtes de Provence for the barbecue, Saint Emilion as a gift or for a festive meal etc.). However, caution is needed since certain wines which were mentioned are sold at very high prices (Château Mouton Rothschild, Petrus and Château Margaux, for example whose prices vary between 300 and 3,500 €, according to the vintage). In real situations, the choice can turn out to be different. Some wines appear to be appropriate for all circumstances. This is notably the case for certain foreign wines: wines from Rioja (Spain), Italy, South America (Argentina and Chile) and Australia as well as for branded wines which are easy to drink (Tariquet) and certain AOC (Médoc, Pessac Léognan and Alsace). For foreign wines, this can be due to the lower knowledge of these wines which can be favoured because of their "exotic" character.

Managerial implications

From the managerial point of view, this study shows that the visual attributes such as the design and the packaging are not sufficient to sell wine to French consumers, even if they are novices in this field. For the expert consumers, information relating to the origin of the wine and the year of production must be very visible because certain regions of production play the role of a brand and this regional identity can be considered as a place-based equity [START_REF] Orth | Dimensions of wine region equity and their impact on consumer preferences[END_REF]. For the novice consumers, the price policy must be adapted to the positioning and to the target so as to avoid an underestimation or an overestimation of the quality and/or the value associated with the wine. The vintage is an attribute considered important by both the novices and the experts. Certain vintages are considered as mythical in the wine world, like 2005 and 2009 for example, and that is sufficient to reassure the consumer: the expert -since (s)he has a precise knowledge of the good vintages according to the regions of production and even the AOC -and the novice because (s)he has the tendency to assume that an exceptional year concerns all the wine-producing regions or all the AOC of a region.

Our results show that the grape variety is not considered as an important attribute, above all by the French novice consumer. The restrictive French legislation could explain the slightest interest of the novice consumers for this attribute5 . Given that the indication of varietals on the label is now authorized for a largest number of wines, this attribute could become more familiar to the novice consumer. A winning strategy for wine producers or wine merchants could consist in associating varietal wines (VW) with IGP (Indication d'origine protégée), particularly for rosé wines. Indeed, rosé wines are the only ones whose sales progress in France both in value (+ 9.2 %) and in volume (+ 6.5 %)6 . Another winning strategy is to sell VW in Bag-in-box. The sales of boxed VW with IGP rose by 12 % while they slightly decreased for bottled VW (-1.1 %). A brand name does not guarantee success either. Several launchings of brands which went against the traditional codes in terms of packaging and communication turned out to be failures. The brands which have succeeded on the French market favour traditional packaging (Mouton Cadet, Baron de Lestac, Tariquet). The professionals therefore have an interest in not straying far from prototypical graphical codes to attract French consumers. This remark does not necessarily hold good for foreign producers who wish to sell their wine in France, since these wines and their more unconventional packaging are today more familiar to consumers. Finally, our results suggest that to help the consumer in his/her choice, it can be useful to associate a given wine with one or several consumption occasions. Communication on wine in France is very carefully controlled and the labels carry a large quantity of legally-required information. New technologies associated with smartphones constitute first-class supports for this type of information. Several projects aim to create data bases which, from a photo taken with a mobile phone, enable the consumer to access a data base and find out more information if (s)he wishes (SmartBordeaux, for example). These data bases can be seen as an extension of the packaging. It is also through this support that the customer could obtain extra information on the production methods -conventional vs. environmentally friendly -and the conditions in which the wine has been matured.

The difference between attribute importance and order in the decision making process is also interesting from the point of view of practitioners. They have to take this into account to determine which attributes require more visibility on the packaging (label, back label…) or on the web site, when the wine is sold on Internet.

Limits and lines of research

This study is not without its limits which as such represent paths to be explored. Firstly, a scenario does not exactly recreate real buying conditions. This objective could be reached with a more elaborate experimental design. The respondent could make his/her choice from pre-defined basket of wines for which (s)he would have detailed information and a photograph. The results of the present study concerning the structure, the size and the composition of the CS could serve as a basis for the development of this experimental design.

We could also imagine a study carried out in a virtual wine shelf display where the participants would be assigned a particular task as, for example, to choose a wine for a meal with friends. Only this type of experimentation would enable us to check a correspondence between declared information -the attributes which are considered important -and the real choice.

Secondly, this study is based on declared information. An evaluation on a scale of importance can turn out to be artificial and perceived as an "endless task". In making market place choice, consumers would probably not have thought about all the attributes. It would be interesting to compare our results with those obtained by other methods, notably the protocols method, the information display board (IDB) method, and/or the best-worst method [START_REF] Cohen | Applying best-worst scaling to wine marketing[END_REF]. The IDB method was shown to yield a measure of greater face validity than conjoint measurement and self-report [START_REF] Heeler | Attribute importance: contrasting measurements[END_REF]. This remark also holds for the ranking of the three first attributes. Trade-off methods could eliminate a certain number of distortions. Moreover, the respondents were asked to rank only three attributes. It was not feasible to ask them for an exhaustive ranking of the 30 attributes of the study, but perhaps three is not enough. Another limitation of this research is the use of a four-point scale to measure the importance of the 30 attributes. The measurement level for the discrimination required could not be sufficient and could explain that ANOVA calculated on that data are not valid.

The qualitative or nominal nature of certain data does not allow to employ statistical methods eliminating the bias due to replicated measures over several consumption occasions (data for H5, for example). Finally, it would have been interesting to analyze the middle group regarding SK. They are nevertheless an important segment even if there were not any differences with the others. Alternative methods like best-worst, protocols and trade-off are well suited to generalize comparisons between the three segments of consumers.

Table I

 I Influence of subjective knowledge on attributes importance*

	Subjective knowledge		Attribute	Importance	SD**
	Low level	Most important	Price	3.34	.819
		(somewhat	Vintage	3.07	.900
		important or
		very important)
		Less important	Alcoholic content	1.92	.991
		(somewhat not	Opinion of the press	1.85	.888
		important or	Vin de pays	1.74	.842
		not important	Organic wine	1.72	.911
		at all)	Environmentally-friendly wine	1.61	.768
			Wine merchant name	1.60	.799
	High level	Most important	Vintage	3.68	.593
		(somewhat	Region of production, terroir	3.64	.604
		important or	Age	3.62	.569
		very important)	AOC	3.44	.800
			Bottled at the estate/ at the château	3.42	.864
			Country of origin	3.31	.921
			Official rankings	3.17	.974
			Château name	3.15	.977
			Price	3.12	.924
		Less important	Alcoholic content	1.92	.986
		(somewhat not	Environmentally-friendly	1.85	.960
		important or	Shape and design of bottle	1.81	.958
		not important	Wine merchant name	1.78	.858
		at all)	Organic wine	1.65	.870
	* The evaluation of the 30 attributes is reported in Appendix I, **SD=Standard deviation

Table II

 II Attributes considered as more important by knowledgeable consumers (in red) and by novice consumers (in blue)

		Subjective knowledge	N	Mean	S. D.	MD	T
	1. Château name	Low level	87	2,79	,942	-0.36	-2.495*
		High level	93	3,15	,977
	2. Grape variety	Low level	87	2,28	,872	-0.68	-4.829***
		High level	93	2,96	1,010
	3. "Bottled at the estate/a the	Low level	87	2,64	,940	-0.78	-5.77***
	château"	High level	93	3,42	,864
	4. AOC	Low level	87	2,80	,950	-0.64	-4.869***
		High level	93	3,44	,800
	8. Colour	Low level	87	2,64	1,023	-0.31	-2.020*
		High level	92	2,96	1,047
	9. Country of origin	Low level	87	2,98	,792	-0.33	-2.608**
		High level	93	3,31	,921
	12. Official rankings	Low level	87	2,61	,867	-0.56	-4.084***
		High level	93	3,17	,974
	13. Region of production,	Low level	87	2,89	,920	-0.76	-6.534***
	Terroir	High level	92	3,64	,604
	17. Vintage	Low level	87	3,07	,900	-0.61	-5.391***
		High level	93	3,68	,593
	20. Type of cork or cap	Low level	87	2,32	1,084	-0.42	-2.463*
		High level	93	2,74	1,197
	28. Age	Low level	87	2,99	,921	-0.64	-5.603***
		High level	93	3,62	,569
	29. "Winegrower"	Low level	87	2,13	,962	-0.75	-4.884***
		High level	93	2,88	1,102
	30. "Aged in oak barrels"	Low level	87	2,33	,960	-0.63	-4.047***
		High level	92	2,97	1,124
	10 Promotions	Low level	87	2,39	1,093	0.35	2.100*
		High level	92	2,04	1,118
	16 Shape and design of bottle	Low level	87	2,47	,963	0.69	5.057***
		High level	93	1,78	,858
	25. General look of the bottle	Low level	87	2,63	,941	0.41	2.975**
		High level	92	2,22	,924
	27. Information on the label and	Low level	87	2,34	,986	0.30	2.038*
	back-label	High level	93	2,04	,999
	SD = Standard Deviation; MD = Mean Difference; * p<0.05; **p<0.01; ***p<0,001

Table III

 III Influence of subjective knowledge on attributes ranking

		Low subjective knowledge (n = 87)	High subjective knowledge (n = 93)
	*1 rst attribute	Price (23 %)	Château name (19.6 %)
		Château name (18.4)	Region of production, terroir (18.5)
	2 d attribute	Vintage (19.5 %)	Vintage (26,1 %)
		Price (11.5)	Château name (14.1)
	3 rd attribute	Price (17.2 %)	Vintage (21.7 %)
		Château name (13.8)	Price (20.7)

Table IV

 IV Attributes importance and ranking

		Most important	Importance (1 to 4)	Expected rank	Rank (1 to 3)
	Expert	Vintage	3.68	1	2
	consumers	Region of production	3.64	2	1*
		Age	3.62	3	-
	Novices	Price	3.34	1	1
	consumers	Vintage	3.07	2	2
		Age	2.99	3	-

* 18.5 % of experts consider region of production as the first attribute (table

III

).

Table V

 V Consideration set size

	You buy wine…	SK	CS size	SD	t-test
	S1. For a gift.	High level	0.79	0.764	-2.038*
		Low level	1.01	1.010
	S2. For a festive meal, a special event.	High level	1.528	1.22	-1.595ns
		Low level	1.817	1.21
	S4. For a meal at friends' home.	High level	1.609	1.22	-3,30**
		Low level	2.258	1.398
	S5. For your usual consumption.	High level	1.275	1.26	-3.077**
		Low level	1.860	1.28
	S6. For a barbecue with friends.	High level	1.114	1.25	-2.283*
		Low level	1.505	1.038

N expert consumers = 93, N novice consumers = 87; dof = 178; SK = subjective knowledge; CS = consideration set; SD = standard deviation; * p<0.05; **p<0.01.

Table VI

 VI Comparison test of proportions

* p< .05

Table VII )

 VII

		Origin of wine	Low SK (per cent)	High SK (per cent)	Z-test
	Scenario 1	Bordeaux wines	.80	.91	2.107*
		Other French wines	.39	.40	0.137
		Foreign wines	.33	.17	-2.332*
	Scenario 2	Bordeaux wines	.85	.90	1.017
		Other French wines	.48	.48	0
		Foreign wines	.23	.18	-0.832
	Scenario 4	Bordeaux wines	.87	.88	0.203
		Other French wines	.47	.66	2.572*
		Foreign wines	.28	.33	0.727
	Scenario 5	Bordeaux wines	.67	.80	1.980*
		Other French wines	.48	.65	2.231*
		Foreign wines	.21	.31	1.667
	Scenario 6	Bordeaux wines	.54	.53	-0.134
		Other French wines	.51	.65	1.494
		Foreign wines	.39	.33	1.118

Table VII

 VII Effects of subjective knowledge on the perceived risk

		SK	N	Perceived Risk	SD	SEM	T	Df
	Scenario 1	Low	87	2.22	.895	.096	2.55*	178
		High	93	1.86	.985	.102
	Scenario 2	Low	87	1.99	.883	.095	1.47ns	178
		High	93	1.77	1.054	.109
	Scenario 4	Low	87	1.90	.778	.083	1.19ns	178
		High	93	1.75	.843	.087
	Scenario 5	Low	86 1	1.65	.794	.086	.54ns	177
		High	93	1.59	.679	.070
	Scenario 6	Low	87	1.89	.920	.099	1.52ns	178
		High	93	1.70	.719	.075
	SK = subjective knowledge; SEM = standard error mean; Df = Degrees of freedom; * p<0.05.
	1. N = 86 because of missing data.

Table VIII

 VIII Perceived risk

	Scenario	N	Perceived risk	SD	SE
	Scenario 1	178 1	2.04	.956	.072
	Scenario 2	179 2	1.88	.979	.073
	Scenario 4	180	1.82	.813	.061
	Scenario 5	178	1.62	.736	.055
	Scenario 6	178	1.76	.796	.060
	SD = standard deviation; SE = standard error.
	1. N=178 because of missing data. 2. N=179 because of missing data

Table IX

 IX Bonferroni's post hoc test*

	Scenario (I)	Scenario (J)	Average difference (I-J)	P value
	Scenario S5	Scenario S2	-.259*	,046
		Scenario S1	-.421***	,000
	Scenario S6	Scenario S1	.281*	,022

* Only significant differences are reported.

GFK/ISL for France AgriMer, July

22, 2010. 2 We thank the reviewers for this comment.

France Agrimer, Infos No 171, December 2010

Viniflhor Infos, Issue 160, February. 2009

Before the European reform of Appellations, the indication of the name of varietals on the label was authorized only for the category of Vins de Pays. This category is now replaced by IGP wines, a new intermediate category, between wines without IGP (renamed Vins de France) for which the indication of varietals is also authorized, and AOC wines for which the indication of varietals is forbidden.

France Agrimer, Infos No 171, December 2010 (comparison 2009[START_REF] Celhay | Design du packaging, appreciation esthétique et intention d'achat : l'impact du jugement d'atypicalité. Une application au cas des vins de Bordeaux[END_REF]).

Appendix I-Attributes importance

.

872

.879 Compared to the average consumer, would you say that your knowledge of wine is (1 = non-existent; 4 = excellent).

.877 I am familiar with wine. (1 = totally disagree; 4 = totally agree).

.825 I know wine very well. (1 = totally disagree; 4 = totally agree).

.865 KMO = 0.819; Bartlett : Khi2=612 (6 df) p<0.001 ; Explained variance: 74%.

Appendix IV -