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Large deviations and Stochastic stability in Population Games

  • * Corresponding author: Mathias Staudigl

    * Corresponding author: Mathias Staudigl 

M. Staudigl is supported by the COST Action CA-16228.Srinivas Arigapudi is supported in part at the Technion by a Fine Fellowship

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  • In this article we review a model of stochastic evolution under general noisy best-response protocols, allowing the probabilities of suboptimal choices to depend on their payoff consequences. We survey the methods developed by the authors which allow for a quantitative analysis of these stochastic evolutionary game dynamics. We start with a compact survey of techniques designed to study the long run behavior in the small noise double limit (SNDL). In this regime we let the noise level in agents' decision rules to approach zero, and then the population size is formally taken to infinity. This iterated limit strategy yields a family of deterministic optimal control problems which admit an explicit analysis in many instances. We then move in by describing the main steps to analyze stochastic evolutionary game dynamics in the large population double limit (LPDL). This regime refers to the iterated limit in which first the population size is taken to infinity and then the noise level in agents' decisions vanishes. The mathematical analysis of LPDL relies on a sample-path large deviations principle for a family of Markov chains on compact polyhedra. In this setting we formulate a set of conjectures and open problems which give a clear direction for future research activities.

    Mathematics Subject Classification: Primary: 91A22, 60F10, 60J10; Secondary: 35F21, 90B20.

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  • Figure 1.  Optimal exit paths with non-binding state constraints

    Figure 2.  Optimal exit paths with indirect exit and binding state constraints

    Figure 3.  Optimal transition paths in Bilingual games

    Figure 4.  Phase portrait of the logit dynamics $ V^{0.1} $ for example (46)

    Table 1.  Coordination Game

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    Table 2.  Bilingual Game

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