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Stern-judging: A simple, successful norm which promotes cooperation under indirect reciprocity.

ABSTRACT: We study the evolution of cooperation under indirect reciprocity, believed to constitute the biological basis of morality. We employ an evolutionary game theoretical model of multilevel selection, and show that natural selection and mutation lead to the emergence of a robust and simple social norm, which we call stern-judging. Under stern-judging, helping a good individual or refusing help to a bad individual leads to a good reputation, whereas refusing help to a good individual or helping a bad one leads to a bad reputation. Similarly for tit-for-tat and win-stay-lose-shift, the simplest ubiquitous strategies in direct reciprocity, the lack of ambiguity of stern-judging, where implacable punishment is compensated by prompt forgiving, supports the idea that simplicity is often associated with evolutionary success.

SUBMITTER: Pacheco JM

PROVIDER: S-EPMC1761656 | biostudies-literature | 2006 Dec

REPOSITORIES: biostudies-literature

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Stern-judging: A simple, successful norm which promotes cooperation under indirect reciprocity.

Pacheco Jorge M JM Santos Francisco C FC Chalub Fabio A C C FA

PLoS computational biology 20061201 12

We study the evolution of cooperation under indirect reciprocity, believed to constitute the biological basis of morality. We employ an evolutionary game theoretical model of multilevel selection, and show that natural selection and mutation lead to the emergence of a robust and simple social norm, which we call stern-judging. Under stern-judging, helping a good individual or refusing help to a bad individual leads to a good reputation, whereas refusing help to a good individual or helping a bad ...[more]

PMID: 17196034

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