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Fairness expectations scaffolded the evolution of larger groups.

Oded Ritov1, Colin R Jacobs1, Jan M Engelmann1

  • 1Department of Psychology, University of California, Berkeley, CA, US. oded.ritov@berkeley.edu colin_jacobs@berkeley.edu jan_engelmann@berkeley.edu.

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Summary

Social expectations, evolving into fairness, were crucial for hominin group size and cohesion. These expectations regulate cooperation, making group living less stressful and more stable.

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Area of Science:

  • Evolutionary Anthropology
  • Social Psychology

Background:

  • Group living presents challenges in maintaining cooperation.
  • Stable, mutually beneficial interactions are essential for social species.

Purpose of the Study:

  • To investigate the role of social expectations in hominin societal development.
  • To explore the evolution of fairness as a driver of cooperation.

Main Methods:

  • Theoretical modeling of social dynamics.
  • Analysis of anthropological evidence for cooperation.

Main Results:

  • Relationship-based social expectations are foundational to cooperation.
  • The evolution of fairness expectations facilitated larger, more cohesive hominin groups.

Conclusions:

  • Social expectations, particularly fairness, are key to understanding hominin societal structure.
  • Regulating interactions through expectations reduces social stress and enhances group stability.