Stochastic Approximation, Cooperative Dynamics and Supermodular Games

Details Stochastic Approximation, Cooperative Dynamics and Supermodular Games Stochastic Approximation, Cooperative Dynamics and Supermodular Games

2010-01-27

arxiv.org/abs/1001.4871v1

Mathematics

Probability

Scientific paper

This paper considers a stochastic approximation algorithm, with decreasing step size and martingale difference noise. Under very mild assumptions, we prove the non convergence of this process toward a certain class of repulsive sets for the associated ordinary differential equation (ODE). We then use this result to derive the convergence of the process when the ODE is cooperative in the sense of [Hirsch, 1985]. In particular, this allows us to extend significantly the main result of [Hofbauer and Sandholm, 2002] on the convergence of stochastic fictitious play in supermodular games.

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