报告题目：A Game-theoretic Model for the Role of Reputation Feedback Systems in Peer-to-peer Commerce 

摘要: We propose a dynamic game-theoretic model to study how a reputation feedback system affects a peer-to-peer (P2P) trading platform. Continuums of buyers and sellers with bounded rationalities are paired to trade periodically. Sellers have private knowledge on their own types that encode tendencies to cheat. Their reputation scores are, on the other hand, visible to all and periodically updated by their trading partners. A buyer can use a seller's score to assess the latter's characters and decide whether to trade. Using a continuity-based fixed point theorem, we first establish the existence of equilibria that convey information on traders' behaviors as well as the type-score composition on the market. We then look into a special case which, for model tractability, includes two types of sellers with two score levels. Besides the proportion of prone-to-cheating sellers, it indicates that how much sellers value their future payoffs also plays a major role in determining the prevalence of online frauds. Therefore, reputation feedback systems are especially beneficial under high trading volumes, which can in turn, for instance, be facilitated by attracting more buyers to the online marketplace.

专家简介：Lian Qi is an associate professor and vice chair of department of supply chain management at Rutgers Business School. He received his Ph.D. and M.S. from University of Florida, his M. Eng. from Zhejiang University and his B.S. from Fudan University. His research interests include supply chain design and management, especially supply chain design under stochastic supply disruptions; production and inventory planning and control; operations management; simulation; design and analysis of optimization algorithms. His papers has published outstanding papers on top level journals, such as Production and Operations Management, Transportation Science, European Journal of Operational Research, Omega, the International Journal of Management Science, International Journal of Production Economics. Dr. Qi is the associate editor of Asia-Pacific Journal of Operational Research and also an editorial board member of Mechanical & Electrical Engineering. He was the recipient of Junior Faculty Award and Junior Faculty Research Award at Rutgers Business School, and Outstanding Faculty Award at University of Missouri – Rolla, where he once worked. 

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