影響左位數效果之因素探討;On the Conditions Affecting the Left-Digit Effect

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题名:	影響左位數效果之因素探討;On the Conditions Affecting the Left-Digit Effect
作者:	王志文;Wang,Jyh-Wen
贡献者:	企業管理學系
关键词:	左位數效果;九結尾價格;字體大小;數字顯示方式;數字間的距離;價格大小;數字位數;韋伯定律;時間距離;動機;left-digit effect;nine-ending price;font size;digit appearance model;distance between digits;price level;number of digits;Weber-Fechner Law;temporal distance;motivation
日期:	2016-06-13
上传时间:	2016-10-13 13:03:45 (UTC+8)
出版者:	國立中央大學
摘要:	左位數效果已被學者證實對價格認知造成影響，當兩個被比較的數字之最左位數不同及較接近時，將產生左位數效果，造成九結尾的價格知覺顯著較低。在先前的研究鮮少探討左位數對價格認知影響的可能干擾變數，本論文者主要探討價格實際顯示的方式、消費者的心理因素、以及更廣泛的價格範圍，在比較價格時對左位數效果與知覺價格差異可能產生之影響。本論文採用實驗設計，透過八個實驗檢驗實體及心理因素，以及更廣泛之價格水準對知覺價格差異的影響，以更深瞭解左位數效果的產生及減弱之處理機制，並希望這樣致力對左位數效果之邊界的瞭解有所貢獻。結果證實，在比較三位數整數的價格時，兩個比較價格之左位數不同時，九結尾價格的知覺價格差異將顯著大於零結尾價格之知覺差異，而當左位數相同時，則無顯著差異。此外，本論文也發現，於非九結尾的條件下，也產生相同的情形。本論文同時發現，價格的字體大小、數字的距離，以及價格的顯示方式，會對左位數與知覺價格差異大小產生影響，當較低的目標價格之字體顯示較大、數字字元間的距離加大，以及採用垂直的顯示方式，將使左位數效果對知覺價格差異大小之影響不顯著。另外，亦發現數字的大小及位數，會干擾左位數對知覺價格差異大小之影響，於三位數整數時，當左位數之數字較大時，及四位數整數時，左位數效果將減弱或不產生，這發現指出左位數效果新邊界的存在。另外，本論文也發現時間壓力及動機，會干擾左位數效果對知覺價格差異大小的影響，當消費者在有時間的壓力下，或於缺乏動機去處理資訊，左位數效果會對價格認知產生影響；但若消費者有動機去處理資訊，且沒有時間壓力的條件下，左位數效果將不產生。;The left-digit effect describes what happens when product prices are presented in a certain way, for example at one cent below a whole number. The influence exerted means that prices are encoded at significantly different levels when the leftmost digit is changed to a lower level (e.g., $3.00 and $2.99), but this is not the case if the leftmost digit remains unchanged (e.g., $3.20 to $3.19). It has been shown that the leftmost digits can exert a disproportionate influence on the encoding of the perceived magnitude of a price when the leftmost digits differ and when the two prices being compared are closer (e.g., $3.99 vs. $5.00 compared to $3.99 vs. $6.00). The left-digit effect has been shown to have a big impact on the perceived numerical difference. However, in prior research relatively little was known about the possible impact of moderating variables on the left-digit effect. In this dissertation, an analog model adapted from the numerical cognition literature (Adaval and Monroe 2002; Monroe and Lee 1999) is used to explore how the left-digit effect and perceived numerical difference may be influenced by physical and psychological factors, and a much wider price level. Eight experiments are carried out to assess the conditions under which the left-digit effect occurs or weakens with the goal at providing a deeper understanding of the processing mechanisms that underlie this form of perceptual distortion. Further, it is hoped that this endeavor will contribute to our understanding of the boundaries to the left-digit effect. The results of study 1 show that a nine ending price affects the perceived difference between two compared prices only if the leftmost digit changes, as in Thomas and Morwitz (2005). In study 2, the empirical study of the left-digit effect to is extended to non-nine ending numbers. Similarly, three digit numbers ending in 7 (e.g., 297 vs. 300) can also be underestimated in the same way as numbers ending in 9 (e.g., 299 vs. 300). Study 3 to study 6 seek to explore the effect of price font size, distance between digits, and orientation (horizontal vs. vertical) on the relationship of left digit and perceived difference between two compared prices. The results indicate that the left-digit effect does not occur when the font size of the target price is magnified, the distance between the price digits is increased or the prices are displayed using a vertical model. In short, price font size, the way the price is displayed, and physical separation between the digits can affect numerical difference perceptions when comparing two prices. In studies 6 and 7 are designed to explore how the left-digit effect and perceived numerical difference may be influenced by both the digit size and the number of digits. In study 6, a comparison of regular and sale prices, specifically three digit integers with different leftmost digits, shows that consumers perceive the price discount to be larger when the left digit is small (e.g., 1 or 4) than when it is large (e.g., 7). The lower the two prices being compared, the more likely it is that the left-digit effect will occur. The results of study 7 show that the perceived discount is likely to diminish when the number of digits is increased to produce a four digit integer. In other words, the number of digits can affect perceptions of the numerical difference when comparing two prices. Thus, the effect of a left-digit change to produce a nine-ending price would be weaker for higher-priced products. The findings indicate the existence of a novel boundary to the left-digit effect. Study 8 is designed to further to explore how the dimensions of psychological distance and motivation affect the left-digit effect. The results suggest that the left-digit effect occurs when participants have a time constraint or have a low motivation to process information; it does not occur when participants have sufficient motivation to process information and the time constraint is less. In other words, when the motivation to deal with information is high and there is little pressure, consumers are more likely to process information systematically which tends to weaken the left-digit effect.
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