Localized perfection

Speaker：Sun Xiang, Professor, Wuhan University

Host：Li Xueheng, Associate Professor, Lingnan College

Time and Date：14:30, May 27, 2026 (Wednesday)

Venue：C.S.LAM Conference Room (103), Lingnan Hall

Language：Chinese

Abstract：

Perfect equilibrium and its refinements are widely studied and typically rely on full-support perturbations. We introduce a delta-localized notion of perfection for games with a continuum of players. It confines perturbations within a delta-neighborhood of the underlying action distribution and eliminates undesirable equilibria from a local perspective. We establish the existence of a pure strategy delta-localized perfect equilibrium and show that it is equivalent to delta-admissible Nash equilibrium. We also study limit versions of delta-localized perfection. Illustrative applications to large routing games and crowd saturation games are presented.

Profile:

Sun Xiang is Professor, Associate Dean, and Doctoral Supervisor at the School of Economics and Management, Wuhan University. He earned his Ph.D. from the National University of Singapore. His research interests include microeconomic theory, game theory, and information economics. His work has been published in leading international journals in economic theory, such as Journal of Economic Theory, Theoretical Economics, and Games and Economic Behavior. He has received multiple grants from the National Natural Science Foundation of China, including the Excellent Young Scientists Fund and the General Program.