產業經濟學研討會          （2017年第12期）      
【時間】2017年12月20日（周三）   12：00－13：30  
【地點】明主734會議室  
【主講】曹志剛  北京交通大學經濟管理學院教授  
【主題】Fashion and Homophily  
【點評】楊繼東   中國人民大學經濟學院副教授  
【摘要】We analyze the evolution of fashion based on a network game model. Each agent in this model is either a conformist or a rebel. A conformist prefers to take the action most common among her neighboring agents, whereas a rebel prefers the opposite. When there is only one type of agent, the model possesses an exact potential function, implying that fashion cycles are unlikely to emerge in a homogeneous population. The homophily index, a measure of segregation in networks with multiple types of nodes, is shown to play a key role in the emergence of fashion cycles. Our main finding is that a lower homophily index, in general, promotes the emergence of fashion cycles. We establish this result through a potential analysis, a partial potential analysis, and a stability analysis of a system of ordinary differential equations that is approximated from a stochastic best response dynamic. Numerical simulations based on a variety of networks confirm that the approximate analysis is reliable.  
 
 
【主講人介紹】曹志剛：北京交通大學經濟管理學院，任“卓越百人計劃”教授（第四層次）。主要研究興趣為博弈論及其應用，包括網絡博弈和算法博弈論等。在相關領域主流刊物發表論文20余篇，包括Games and Economic Behavior、Social Choice and Welfare 和Theoretical Computer Science等期刊以及Economics & Computation等會議。  
 
 
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