The Actual Structure of eBayâ€™s Feedback Mechanism and Early Evidence on the Effects of Recent Changes
eBayâ€™s feedback mechanism is considered crucial to establishing and maintaining trust on the worldâ€™s largest trading platform. The effects of a userâ€™s reputation on the probability of sale and on prices are at the center of a large number of studies. More recent theoretical work considers aspects of the mechanism itself. Yet, there is confusion amongst users about its exact institutional details, which also changed substantially in the last few months. An understanding of these details, and how the mechanism is perceived by users, is crucial for any assessment of the system. We provide a thorough description of the institutional setup of eBayâ€™s feedback mechanism, including recent changes to it. Most importantly, buyers now have the possibility to leave additional, anonymous ratings on sellers on four different criteria. We discuss the implications of these changes and provide first descriptive evidence on their impact on rating behavior.
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