[J39] - Survival of dominated strategies under imitation dynamics

P. Mertikopoulos and Y. Viossat. Journal of Dynamics and Games, W. H. Sandholm memorial issue, vol. 9, no. 4, pp. 499-528, October 2022.


The literature on evolutionary game theory suggests that pure strategies that are strictly dominated by other pure strategies always become extinct under imitative game dynamics, but they can survive under innovative dynamics. As we explain, this is because innovative dynamics favour rare strategies while standard imitative dynamics do not. However, as we also show, there are reasonable imitation protocols that favour rare or frequent strategies, thus allowing strictly dominated strategies to survive in large classes of imita- tion dynamics. Dominated strategies can persist at nontrivial frequencies even when the level of domination is not small.

arXiv link: https://arxiv.org/abs/2209.08416

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