Antitrust & Competition Policy Blog

Editor: D. Daniel Sokol
University of Florida
Levin College of Law

Thursday, September 2, 2010

Robustness to Strategic Uncertainty

Posted by D. Daniel Sokol

Ola Andersson (Stockholm School of Economics), Cédric Argenton (CentER & TILEC, Tilburg University), Jörgen W. Weibull (Stockholm School of Economics and Ecole Polytechnique) explain Robustness to Strategic Uncertainty.

ABSTRACT: We model a player's uncertainty about other players' strategy choices as smooth probability distributions over their strategy sets. We call a strategy profile (strictly) robust to strategic uncertainty if it is the limit, as uncertainty vanishes, of some sequence (all sequences) of strategy profiles, in each of which every player's strategy is optimal under under his or her uncertainty about the others. We derive general properties of such robustness, and apply the definition to Bertrand competition games and the Nash demand game, games that admit infinitely many Nash equilibria. We show that our robustness criterion selects a unique Nash equilibrium in the Bertrand games, and that this agrees with recent experimental findings. For the Nash demand game, we show that the less uncertain party obtains the bigger share.

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