Please use this identifier to cite or link to this item: http://hdl.handle.net/10419/59627
Authors: 
de Castro, Luciano I.
Year of Publication: 
2008
Series/Report no.: 
Discussion Paper, Center for Mathematical Studies in Economics and Management Science 1463
Abstract: 
Many conditions have been introduced to weaken the continuity re-quirements for equilibrium existence in games. We introduce a new con-dition, called regularity, that is simple and easy to verify. It is implied both by Reny's better-reply security and Simon and Zame's endogenous sharing rule method. Regularity implies that the limits of €-equilibria are equilibria. Since this condition is weak, it is yet not enough to ensure pure strategy equilibrium existence, but we are able to identify extra conditions that, together with regularity, are sufficient for equilibrium existence. One is the marginal continuity property introduced by Prokopovych (2008), while the second is the well behavior of a sequence of approximating con-tinuous functions. In this way, we provide new equilibrium existence re-sults for discontinuous games under conditions that are simpler and easier to check than most of the available alternatives.
Subjects: 
discontinuous games
weak payoff security
better-reply security
regularity
regular games
epsilon-equilibria
approximating sequence
JEL: 
C72
C73
Document Type: 
Working Paper

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