【Micro Seminar】Robust Social Learning from Unordered Actions
2026/10/02
研討會日期 : 2026-10-02
時間 : 14:00
主講人 : Professor Kevin He
地點 : Conference Room B110
主持人 : Professor Yi-Hsuan Lin
演講者簡介 : Dr. Kevin He received his Ph.D. in Economics from Harvard University in 2019. He is currently an Assistant Professor of Economics at the University of Pennsylvania. His research interests are Microeconomic Theory and Behavioral Economics.
演講摘要 : People often learn from others' actions without observing the chronology of who influenced whom. We study a sequential social-learning model where agents observe predecessors' actions as an unordered set and minimize worst-case expected loss across move orders. The unique equilibrium with this robust decision criterion is DeGroot aggregation: each agent equally averages their private signal and all previous actions. Robust actions are disproportionately influenced by early signals and converge to a random consensus centered around the true state. By contrast, Bayesian agents in the same environment learn the state, as does a Bayesian observer who sees the unordered actions of robust agents.
