Research indicates that mood can influence evaluation of a product when considered in isolation. However, little is known about its influence on comparisons among several alternatives. Four experiments assessed the nature of this influence. When evaluating each option individually upon encountering it, happy participants reported greater preferences for the first encountered option than unhappy participants. When withholding evaluations until having seen all options, however, happy participants reported greater preferences for the last encountered option than unhappy participants. Which comparison strategy was employed, and consequently the impact of mood on preferences, depended on the similarity of choice alternatives in terms of appearance versus descriptive features.T he affect that consumers happen to be experiencing at the time they evaluate a stimulus can provide information about their liking for the stimulus and, therefore, can influence their evaluation of it. Research in both social psychology and consumer judgment has demonstrated this influence and has circumscribed the conditions in which the effect occurs