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PNAS Nexus|March 27, 2023
"Doing what others do" does not stabilize continuous normsMinhua Yan, Sarah Mathew, Robert BoydProceedings 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|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 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. 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 14