Coordinated punishment of defectors sustains cooperation and can proliferate when rare

Robert Boyd, Herbert Gintis, Samuel Bowles

Research output: Contribution to journalArticlepeer-review

333 Scopus citations

Abstract

Because mutually beneficial cooperation may unravel unless most members of a group contribute, people often gang up on free-riders, punishing them when this is cost-effective in sustaining cooperation. In contrast, current models of the evolution of cooperation assume that punishment is uncoordinated and unconditional. These models have difficulty explaining the evolutionary emergence of punishment because rare unconditional punishers bear substantial costs and hence are eliminated. Moreover, in human behavioral experiments in which punishment is uncoordinated, the sum of costs to punishers and their targets often exceeds the benefits of the increased cooperation that results from the punishment of free-riders. As a result, cooperation sustained by punishment may actually reduce the average payoffs of group members in comparison with groups in which punishment of free-riders is not an option. Here, we present a model of coordinated punishment that is calibrated for ancestral human conditions and captures a further aspect of reality missing from both models and experiments: The total cost of punishing a free-rider declines as the number of punishers increases. We show that punishment can proliferate when rare, and when it does, it enhances group-average payoffs.

Original languageEnglish (US)
Pages (from-to)617-620
Number of pages4
JournalScience
Volume328
Issue number5978
DOIs
StatePublished - Apr 30 2010
Externally publishedYes

ASJC Scopus subject areas

  • General

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