产业经济学研讨会 （2017年第12期）
【时间】2017年12月20日（周三） 12：00－13：30
【地点】明主734会议室
【主讲】曹志刚 北京交通大学经济管理学院教授
【主题】fashion and homophily
【点评】杨继东 中国人民大学经济学院副教授
【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.
【主讲人介绍】曹志刚：北京交通大学经济管理学院，任“卓越百人计划”教授（第四层次）。主要研究兴趣为博弈论及其应用，包括网络博弈和算法博弈论等。在相关领域主流刊物发表论文20余篇，包括games and economic behavior、social choice and welfare 和theoretical computer science等期刊以及economics & computation等会议。
欢迎相关领域老师和同学关注并参加！如有意作为点评老师或宣讲学生参加前沿文献选读活动，可以联系经济学院李三希老师（sanxi@ruc.edu.cn）或者学生助理武玙璠（wuyufan0103@126.com）。
