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Learning from Online Ratings

Author

Listed:
  • Xiang Hui
  • Tobias J. Klein
  • Konrad O. Stahl

Abstract

Online ratings play an important role in many markets. However, how fast they can reveal seller types remains unclear. To study this question, we propose a new model in which a buyer learns about the seller’s type from previous ratings and her own experience and rates the seller if she learns enough. We derive two testable implications and verify them using administrative data from eBay. We also show that alternative explanations are unlikely to explain the observed patterns. After having validated the model in that way, we calibrate it to eBay data to quantify the speed of learning. We find that ratings can be very informative. After 25 transactions, the likelihood of correctly predicting the seller type is above 95 percent.

Suggested Citation

  • Xiang Hui & Tobias J. Klein & Konrad O. Stahl, 2024. "Learning from Online Ratings," CESifo Working Paper Series 11171, CESifo.
    • Handle: RePEc:ces:ceswps:_11171
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    References listed on IDEAS

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    More about this item

    Keywords

    online markets; rating; reputation; Bayesian learning;
    All these keywords.

    JEL classification:

    • D83 - Microeconomics - - Information, Knowledge, and Uncertainty - - - Search; Learning; Information and Knowledge; Communication; Belief; Unawareness
    • L12 - Industrial Organization - - Market Structure, Firm Strategy, and Market Performance - - - Monopoly; Monopolization Strategies
    • L13 - Industrial Organization - - Market Structure, Firm Strategy, and Market Performance - - - Oligopoly and Other Imperfect Markets
    • L81 - Industrial Organization - - Industry Studies: Services - - - Retail and Wholesale Trade; e-Commerce

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