Please use this identifier to cite or link to this item: https://hdl.handle.net/10419/263245 
Year of Publication: 
2022
Series/Report no.: 
Working Paper No. 414
Version Description: 
Revised version, August 2022
Publisher: 
University of Zurich, Department of Economics, Zurich
Abstract: 
Payoff security combined with reciprocal upper semicontinuity is sufficient for better-reply security, and consequently for the existence of a pure strategy Nash equilibrium in compact, quasiconcave games by Reny's (1999) theorem. Analogously, diagonal payoff security combined with upper semicontinuity of the diagonal payoff function has been widely understood to be sufficient for diagonal better-reply security, and consequently for the existence of a symmetric pure strategy Nash equilibrium in compact, diagonally quasiconcave, quasi-symmetric games. We show by example that this is incorrect. Specifically, diagonal better-reply security may fail to hold, and a symmetric pure strategy equilibrium may fail to exist, if some player's payoff function lacks lower semicontinuity, with respect to the opponents' symmetric strategy profile, at all strategy profiles reached from a non-equilibrium profile on the diagonal by a unilateral better response of that player. These difficulties disappear, both in the game and in its mixed extension, if the lower bound on a player's payoff in the definition of diagonal payoff security is raised to reflect the higher levels that arbitrary better responses may achieve. We also discuss the relationship between our strengthened condition and diagonal payoff security.
Subjects: 
Discontinuous games
equilibrium existence
quasi-symmetric games
diagonal payoff security
JEL: 
C62
C72
Persistent Identifier of the first edition: 
Document Type: 
Working Paper

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