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Insuperable strategies in two-player and reducible multi-player games

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  • Fabio A. C. C. Chalub
  • Max O. Souza

Abstract

Real populations are seldom found at the Nash equilibrium strategy. The present work focuses on how population size can be a relevant evolutionary force diverting the population from its expected Nash equilibrium. We introduce the concept of insuperable strategy, a strategy that guarantees that no other player can have a larger payoff than the player that adopts it. We show that this concept is different from the rationality assumption frequently used in game theory and that for small populations the insuperable strategy is the most probable evolutionary outcome for any dynamics that equal game payoff and reproductive fitness. We support our ideas with several examples and numerical simulations. We finally discuss how to extend the concept to multiplayer games, introducing, in a limited way, the concept of game reduction.

Suggested Citation

  • Fabio A. C. C. Chalub & Max O. Souza, 2025. "Insuperable strategies in two-player and reducible multi-player games," Papers 2502.07652, arXiv.org.
  • Handle: RePEc:arx:papers:2502.07652
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