The 3rd ISEG Research seminar of the 2024-25 academic year will be attended by Tobias Kleinprofessor at Tilberg University, who will present a paper entitled "Learning from Online Ratings“.
The session takes place on September 25, from 1 p.m. to 2 p.m., in Amphitheater 3 (Quelhas Building, floor 4).
Free admission.
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.