Sure friends in unsure times: Opportunity network and activated subnetwork for risk-sharing
数学专题报告
报告题目(Title)：Sure friends in unsure times: Opportunity network and activated subnetwork for risk-sharing
报告人(Speaker)：曹志刚（北京交通大学）
地点(Place)：后主楼1124
时间(Time)：2026年1月9日（周五）13:30-14:30
邀请人(Inviter)：张博宇
报告摘要
In a favor exchange (informal risk-sharing) environment, we distinguish an opportunity network from an endogenously activated subnetwork, the former captures pairs of agents who can potentially help each other while the latter represents those who actually provide assistance in equilibrium. We show that an activated subnetwork normally consists of like friends, each having a moderate and similar number of activated links, even when they have diverse degrees in the opportunity network. We find that trees and preferential-attachment networks are generally ineffective for risk-sharing. We also show that an increase in the intensity of negative shocks does not necessarily lead to a decline in social welfare.
主讲人简介
曹志刚，北京交通大学经济管理学院教授。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。相关成果曾获中国信息经济学理论贡献奖、系统科学与系统工程青年科技奖、中国决策科学青年科技奖和关肇直青年研究奖等荣誉。先后主持国家自然科学基金委的青年、面上和优青项目。兼任中国“双法”研究会智能决策与博弈分会副理事长、中国运筹学会博弈论分会副理事长、中国系统工程学会副秘书长、中国信息经济学会副秘书长、管理科学与工程学会理事和中国运筹学会理事等职务。
