title: Reciprocity: you have to think different.
authors.affiliation: Department of Anthropology, University of California, Los Angeles, CA, USA. robert.t.boyd@gmail.com
authors.forename: R
authors.initials: R
authors.lastname: Boyd
mesh_terms: D000533:Altruism; D000818:Animals; D001522:Behavior, Animal; D005075:Biological Evolution; D003299:Cooperative Behavior; D005716:Game Theory; D006801:Humans; D008954:Models, Biological; D011678:Punishment; D012641:Selection, Genetic