中山大学学海讲坛(第1讲)暨岭南学术论坛系列讲座(第655期)
A Network Game Model of Community Formation and Risk Sharing
摘要:
We investigate informal risk sharing using a dynamic network game model. In each round, a randomly selected agent experiences a negative shock, and the agent's friends decide whether to provide assistance. Assuming that agents have concave utility functions, we prove a version of the Folk Theorem. Our analysis shows that a pair of agents are able to help each other in all relevant rounds of a subgame perfect Nash equilibrium if and only if this connection is a part of a subgraph, in which each agent has a number of friends that is neither too low nor too high. We refer to this type of a subgraph as an inner-core. Connected inner-cores can be understood as communities. Although optimization problems related to inner-cores are generally NP-hard, we are able to perform several natural comparative statics.(joint work with Guopeng Li and Yiqing Xing)

报告人
曹志刚,北京交通大学经济管理学院教授,国家优青。2010年毕业于中科院数学与系统科学研究院并留院任助理研究员。2017年9月加盟北京交通大学经济管理学院,任“卓越百人计划”教授。长期从事合作博弈、交通博弈、网络博弈和算法博弈等方面的研究,在包括Operations Research、Mathematics of Operations Research、Games and Economic Behavior、Journal of Mathematical Economics、Social Choice and Welfare、International Journal of Game Theory和《中国科学:数学》在内的期刊上发表多篇论文。
中山大学学海讲坛(第1讲) ,由中山大学党委办公室主办,中山大学岭南学院承办。
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