The Dynamics of Reputation Systems

Amir Ban & Nati Linial1

Online reputation systems collect, maintain and disseminate reputations as a summary numerical score of past interactions of an establishmentwith its users. As reputation systems, including web search engines, gain inpopularity and become a common method for people to select sought services, adynamical system unfolds: Experts' reputation attracts the potential customers.The experts' expertise affects the probability of satisfying the customers. Thisrate of success in turn influences the experts' reputation. We consider hereseveral models where each expert has innate, constant, but unknown level ofexpertise and a publicly known, dynamically varying, reputation.The specific

November, 2010
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