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Natural selection and social preferences.

Jörgen W Weibull1, Marcus Salomonsson

  • 1Stockholm School of Economics, Box 6501, SE-113 83 Stockholm, Sweden. jorgen.weibull@hhs.se

Journal of Theoretical Biology
|September 22, 2005
PubMed
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This study introduces a novel selection dynamic for evolutionary game theory, explaining altruistic and spiteful behaviors in populations. It models how group payoffs influence offspring survival, offering new insights into social preferences.

Area of Science:

  • Evolutionary Game Theory
  • Behavioral Economics
  • Population Dynamics

Background:

  • Individuals in populations play symmetric games within randomly formed groups.
  • Offspring survival depends on individual payoffs and potentially group members' payoffs due to cooperative breeding or competition.

Purpose of the Study:

  • To introduce and analyze a new selection dynamic for evolutionary games.
  • To explain social behaviors like altruism and spite using this dynamic.

Main Methods:

  • Developed a population dynamic equivalent to the replicator dynamic for derived game payoffs.
  • Applied the dynamic to various games: Prisoner's Dilemma (with/without punishment), coordination games, and Hawk-Dove games.
  • Compared outcomes with the standard replicator dynamic.

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Main Results:

  • The new selection dynamic can explain behaviors not captured by the standard replicator dynamic.
  • Demonstrated the dynamic's ability to account for altruistic and spiteful actions.
  • Revealed-preference arguments support the model's consistency with social preferences.

Conclusions:

  • The proposed selection dynamic offers a framework for understanding complex social behaviors in evolutionary game theory.
  • This model provides a mechanism to explain seemingly altruistic or spiteful actions based on group payoff structures.
  • The findings contribute to a deeper understanding of the evolution of social preferences.