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Free mobility across group boundaries promotes intergroup cooperation.

Jörg Gross1, Martin Götz2, Katharina Reher2

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Fostering cooperation across groups is vital. This study shows that voluntary movement between groups, even with few mobile individuals, significantly boosts intergroup cooperation through indirect reciprocity.

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Area of Science:

  • Social Psychology
  • Behavioral Economics
  • Game Theory

Background:

  • Group cooperation is essential for human society but often limited to in-groups.
  • Understanding mechanisms to promote cooperation across group boundaries is a key challenge.

Purpose of the Study:

  • To investigate the impact of voluntary mobility across group boundaries on intergroup cooperation.
  • To determine if and how indirect reciprocity can be leveraged to enhance cooperation between different groups.

Main Methods:

  • Experimental design with two groups of participants making decisions on benefit creation.
  • Implementation of an 'enforcement stage' allowing for indirect reciprocity through rewarding actions.
  • Comparison of cooperation levels under conditions of forced in-group interaction, forced out-group interaction, and free mobility.

Main Results:

  • Indirect reciprocity enforced in-group cooperation but decreased intergroup cooperation when mobility was restricted.
  • Forced interaction solely with out-group members led to higher intergroup cooperation.
  • Free mobility significantly increased intergroup cooperation, with a few mobile individuals driving this effect.

Conclusions:

  • Voluntary intergroup mobility is a powerful mechanism for enhancing cooperation across group boundaries.
  • Even limited movement can enable indirect reciprocity to transcend group divisions.
  • Facilitating free movement is crucial for overcoming the inherent limitations of group-based cooperation.