Given the positive bias toward attractive people in society, online sellers are justifiably apprehensive about perceptions of their profile pictures. Although the existing literature emphasizes the “beauty premium” and the “ugliness penalty,” the current studies of seller profile pictures on customer-to-customer e-commerce platforms find a U-shaped relationship between facial attractiveness and product sales (i.e., both beauty and ugliness premiums and, thus, a “plainness penalty”). By analyzing two large data sets, the authors find that both attractive and unattractive people sell significantly more than plain-looking people. Two online experiments reveal that attractive sellers enjoy greater source credibility due to perceived sociability and competence, whereas unattractive sellers are considered more believable on the basis of their perceived competence. While a beauty premium is apparent for appearance-relevant products, an ugliness premium is more pronounced for expertise-relevant products and for female consumers evaluating male sellers. These findings highlight the influence of facial appearance as a key vehicle for impression formation in online platforms and its complex effects in e-commerce and marketing.

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While online platforms often provide a single composite rating and the ratings of different attributes of a product, they largely ignore the attribute characteristics and customer criticality, which limits managerial action. We propose a multi-facet item response theory (MFIRT) approach to simultaneously examine the effects of product attributes, reviewer criticality, consumption situation, product type, and time in assessing latent customer satisfaction. Analyses of hotel ratings from TripAdvisor and beer ratings from BeerAdvocate suggest that product attributes differ with respect to their discriminating and threshold characteristics and that reviewer segments emphasize different attributes when rating various products over time. The MFIRT approach predicts product performance more accurately than alternative methods and provides novel insights to inform marketing strategies. The MFIRT framework can fundamentally advance how we analyze customer satisfaction and other consumer attitudes and improve marketing research and practice.Keywords Online product ratings . Customer satisfaction . Product attributes . Multi-facet item response theory approach . E-commerce Customer satisfaction data provide firms with critical information on how to improve their product quality. Many firms collect such information on a regular basis using a multiattribute attitude model (Hanson 1992). They can also access * Ling Peng

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