Why do humans often cooperate in groups, even when free-riding on efforts of others is possible? This study shows that between-group competition is important for enhancing within-group cooperation.
Human subjects playing a "public goods" - social dilemma game cooperated at a high level when there was competition between groups, but without group competition cooperation and its associated benefits diminished. Further, between-group competition intensified emotions of anger and guilt associated with violations of the cooperative norm.
The study suggests an important role for group conflict in the evolution of human cooperation and moral emotions
Proceedings of the Royal Society B: Biological Sciences
Proceedings B is the Royal Society's flagship biological research journal, dedicated to the rapid publication and broad dissemination of high-quality research papers, reviews and comment and reply papers. The scope of journal is diverse and is especially strong in organismal biology.
Proceedings of the Royal Society B: Biological Sciences
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