Penny Wise and Pound Foolish: The Left‐Digit Effect in Price Cognition

Abstract

Through five experiments, we provide a cognitive account of when and why nine-ending prices are perceived to be smaller than a price one cent higher. First, this occurs only when the leftmost digits of the prices differ (e.g., $2.99 vs. $3.00). Second, the left-digit effect also depends on the numerical and psychological distances between the target price and a competing product's price. The closer the two prices being compared, the more likely is the left-digit effect. Third, the left-digit effect is not restricted to the domain of prices; it also manifests with other multidigit numbers.