Working Paper Series, Department of Economics, University of Zurich 63
A strategy profile of a game is called robustly stochastically stable if it is stochastically stable for a given behavioral model independently of the specification of revision opportunities and tie-breaking assumptions in the dynamics. We provide a simple radius-coradius result for robust stochastic stability and examine several applications. For the logit-response dynamics, the selection of potential maximizers is robust for the subclass of supermodular N-player binary-action games. For the mistakes model, robust selection results obtain for best-reply dynamics in the same class of games under the weaker condition of strategic complementarity. Further, both the selection of risk-dominant strategies in coordination games under best-reply and the selection of Walrasian strategies in aggregative games under imitation are robust.
learning in games stochastic stability radius-coradius theorems logit-response dynamics mutations imitation