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Proceedings. Biological Sciences|January 9, 2009
When does optional participation allow the evolution of cooperation?Sarah Mathew, Robert BoydNature Human Behaviour|January 5, 2021
Arbitration supports reciprocity when there are frequent perception errorsRobert Boyd, Sarah MathewProceedings of the National Academy of Sciences of the United States of America|June 15, 2011
Punishment sustains large-scale cooperation in prestate warfareSarah Mathew, Robert BoydPNAS Nexus|March 27, 2023
"Doing what others do" does not stabilize continuous normsMinhua Yan, Sarah Mathew, Robert BoydThe Behavioral and Brain Sciences|February 1, 2012
The punishment that sustains cooperation is often coordinated and costlySamuel Bowles, Robert Boyd, Sarah Mathew, et al.Proceedings of the National Academy of Sciences of the United States of America|June 20, 2025
A norm about harvest division is maintained by a desire to follow tradition, not by social policingMinhua Yan, Zhizhong Li, Yuanmei Li, et al.Proceedings. Biological Sciences|July 16, 2024
Third-party arbitration and forgiving strategies increase cooperation when perception errors are commonHillary Lenfesty, Sarah Mathew, Thomas Fikes, et al.Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences|April 4, 2022
Turkana warriors' call to arms: how an egalitarian society mobilizes for cattle raidsSarah MathewPageof 13