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Why cooperation is not running away.

Félix Geoffroy1, Nicolas Baumard2, Jean-Baptiste André2

  • 1Institut des Sciences de l'Évolution, UMR 5554 - CNRS - Université Montpellier, Montpellier, France.

Journal of Evolutionary Biology
|July 13, 2019
PubMed
Summary
This summary is machine-generated.

Partner choice can drive cooperation, but frictionless choices may lead to unprofitable escalation. However, flexible partner choice can optimize cooperation levels, aligning with social efficiency in human interactions.

Keywords:
biological marketscompetitive altruismhuman cooperationmatchingmodelspartner choice

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Area of Science:

  • Evolutionary biology
  • Behavioral economics
  • Game theory

Background:

  • Partner choice is crucial for the evolution of cooperation, particularly in humans.
  • Competitive altruism suggests individuals invest more in cooperation to be chosen.
  • Previous models explored the evolutionary dynamics of cooperation under partner choice.

Purpose of the Study:

  • To investigate the quantitative level of cooperation that evolves under partner choice mechanisms.
  • To analyze the impact of partner-switching costs on cooperation escalation.
  • To explore how flexible choosiness influences the evolution of cooperation.

Main Methods:

  • Utilized a classic adaptive dynamics model to simulate cooperation evolution.
  • Incorporated concepts from matching theory in economics.
  • Analyzed scenarios with varying costs of changing partners.

Main Results:

  • Low partner-switching costs can lead to a profitless escalation of cooperation (runaway cooperation).
  • Frictionless partner choice results in cooperation levels where costs negate benefits.
  • Flexible choosiness, dependent on an individual's cooperation level, leads to socially optimal cooperation.

Conclusions:

  • Partner choice can lead to inefficient cooperation if frictionless.
  • Flexible choosiness prevents runaway cooperation and promotes socially optimal outcomes.
  • This model explains how human cooperation can be constrained by social efficiency considerations.