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Yohsuke Murase1, Christian Hilbe2

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Summary
This summary is machine-generated.

Cooperation relies on social norms and reputation. A new model shows cooperation stability hinges on correlated opinions, not just norms. Independent opinions prevent stable cooperation.

Keywords:
conformitycooperationevolutionary game theoryindirect reciprocitysocial norms

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Area of Science:

  • Evolutionary game theory
  • Social psychology
  • Behavioral economics

Background:

  • Human cooperation is extensive, often explained by indirect reciprocity.
  • Social norms and reputation management are key drivers of cooperation.
  • Existing models (public vs. private assessment) yield differing conclusions on cooperation stability.

Purpose of the Study:

  • To unify differing results from public and private assessment models of cooperation.
  • To identify the core factor determining the stability of cooperation under social norms.
  • To investigate the role of opinion correlation in the evolution of cooperation.

Main Methods:

  • Development of a unified theoretical framework for cooperation models.
  • Mathematical modeling of social norms, reputation, and opinion dynamics.
  • Analysis of evolutionary stability conditions for cooperative norms.

Main Results:

  • Cooperation stability is determined by the correlation of individual opinions.
  • Cooperative norms are not evolutionarily stable when individual opinions are statistically independent.
  • Group norms and social interaction structures influence opinion correlation.

Conclusions:

  • A unified model reconciles public and private assessment findings.
  • Opinion correlation is crucial for maintaining cooperation.
  • Implications for understanding conformity, polarization, and the evolution of social behavior.