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The evolution of norms.

F A C C Chalub1, F C Santos, J M Pacheco

  • 1Centro de Matemática e Aplicações Fundamentais, Universidade de Lisboa, Av. Prof Gama Pinto 2, P-1649-003, Lisboa, Portugal. chalub@cii.fc.ul.pt

Journal of Theoretical Biology
|January 4, 2006
PubMed
Summary

This study introduces a two-level selection model to understand social norm evolution. It reveals a common social norm promoting reputation-based cooperation, favoring simple rules with forgiveness and strict punishment.

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Area of Science:

  • Evolutionary Game Theory
  • Social Science
  • Behavioral Economics

Background:

  • Social norms are crucial for societal function but their evolutionary origins remain debated.
  • Existing models often struggle to capture the multi-level dynamics of social norm evolution.
  • Understanding the emergence of cooperation and norm adherence is a fundamental challenge.

Purpose of the Study:

  • To develop and analyze a two-level selection model for the evolution of social norms.
  • To investigate how individual and group-level selection interact in shaping norms.
  • To identify the characteristics of norms that promote cooperation and stability.

Main Methods:

  • Developed a two-level selection model within the evolutionary game theory framework.
  • Simulated an archipelago of communities with individual and group-level selection dynamics.
  • Applied extensive statistical analysis to model outcomes.

Main Results:

  • Identified the emergence of a single, common social norm across communities.
  • Demonstrated that evolutionary outcomes in diverse communities can be by-products of this single norm.
  • Observed that the emergent norm incentivizes reputation-based cooperative behavior.

Conclusions:

  • Simple, unambiguous social norms are evolutionarily favored.
  • Norms that incorporate forgiveness and repentance alongside implacable punishment are robust.
  • This model provides a framework for understanding the evolution of cooperation through social norms.

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