A constructive and elementary proof of Reny's theorem
In a recent but well known paper, Reny proved the existence of Nash equilibria for better-reply-secure games, with possibly discontinuous payoff functions. Reny's proof is purely existential, and is similar to a contradiction proof : it gives non hint of a method to compute a Nash equilibrium in the class of games considered. In this paper, we adapt the arguments of Reny in order to obtain, for better-reply-secure games : an elementary proof of Nash equilibria existence, which is a consequence of Kakutani's theorem, and a " constructive " proof, in the sense that we obtain Nash equilibria as limits of fixed-point of well chosen correspondences.
|Date of creation:||Jan 2006|
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- Jean-Marc Bonnisseau & Pascal Gourdel & Hakim Hammami, 2005.
"Existence d'un équilibre de Nash dans un jeu discontinu,"
Cahiers de la Maison des Sciences Economiques
b05099, Université Panthéon-Sorbonne (Paris 1).
- Jean-Marc Bonnisseau & Pascal Gourdel & Hakim Hammami, 2005. "Existence d'un équilibre de Nash dans un jeu discontinu," Université Paris1 Panthéon-Sorbonne (Post-Print and Working Papers) halshs-00173781, HAL.
- Philip J. Reny, 1999. "On the Existence of Pure and Mixed Strategy Nash Equilibria in Discontinuous Games," Econometrica, Econometric Society, vol. 67(5), pages 1029-1056, September. Full references (including those not matched with items on IDEAS)
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