One approach to the modeling of bounded rationality in games is based on the dynamics of evolution and learning. An alternative static and equilibrium-based approach has been developed recently by Osborne and Rubinstein. This paper formalizes Osborne and Rubinstein's dynamic interpretation of their equilibrium concept, uses the criterion of dynamic stability as an equilibrium refinement, and shows that stable equilibria can involve the playing of strictly dominated actions while dominant strategy equilibria can be unstable. These effects cannot occur under standard evolutionary game dynamics. Sufficient conditions for the instability of equilibria are provided for symmetric and asymmetric games. Journal of Economic Literature Classification Number: C72.
I thank Ariel Rubinstein for comments on an earlier version of this paper, and an anonymous referee for suggesting a number of improvements. Financial support from the National Science Foundation under grant SBR-9812379 is gratefully acknowledged.