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Evolution of spite through indirect reciprocity.

Rufus A Johnstone1, Redouan Bshary

  • 1Department of Zoology, University of Cambridge, Downing Street, CB2 3EJ, UK. raj1003@hermes.cam.ac.uk

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|September 7, 2004
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Summary

Indirect reciprocity can explain cooperation but may also promote costly spiteful behavior. Spiteful individuals can persist if observers avoid aggressing against them, a form of negative indirect reciprocity.

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Area of Science:

  • Evolutionary biology
  • Behavioral economics
  • Game theory

Background:

  • Cooperation is crucial but challenged by cheating.
  • Indirect reciprocity (reputation-based helping) is a proposed solution.
  • Existing models primarily focus on cooperation, not costly spite.

Purpose of the Study:

  • To investigate if indirect reciprocity can also support spiteful behavior.
  • To explore conditions under which spiteful behavior persists.
  • To examine the role of observer reactions in the evolution of spite.

Main Methods:

  • Theoretical modeling of social interactions.
  • Analysis of evolutionary game theory dynamics.
  • Simulation of agent-based interactions with reputation.

Main Results:

  • Indirect reciprocity does not exclusively favor cooperation.
  • Spiteful behavior, costly to both actor and recipient, can be sustained.
  • Spite persists when spiteful individuals are less likely to face aggression from observers.

Conclusions:

  • Indirect reciprocity can drive the evolution of costly spite.
  • Observer responses (negative indirect reciprocity) are critical for understanding social behavior.
  • This challenges the view that indirect reciprocity solely promotes altruism.