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Traditional models of economic decision-making assume that people are self-interested rational maximizers. Empirical research has demonstrated, however, that people will take into account the interests of others and are sensitive to norms of cooperation and fairness. In one of the most robust tests of this finding, the ultimatum game, individuals will reject a proposed division of a monetary windfall, at a cost to themselves, if they perceive it as unfair.

Here we show that in an ultimatum game, humans' closest living relatives, chimpanzees Pan troglodytes , are rational maximizers and are not sensitive to fairness.

These results support the hypothesis that other-regarding preferences and aversion to inequitable outcomes, which play key roles in human social organization, distinguish us from our closest living relatives.

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Visalberghi E, Anderson J. Visalberghi E, et al. PMID: No abstract available. Similar articles Theft in an ultimatum game: chimpanzees and bonobos are insensitive to unfairness.

Kaiser I, et al. Biol Lett. Epub Aug Fair game for chimpanzees. How primates including us! Brosnan SF. PMID: Chimpanzees may recognize motives and goals, but may not reckon on them. Call J, Jensen K. Call J, et al. Novartis Found Symp. PMID: Review. Varieties of altruism in children and chimpanzees. Warneken F, Tomasello M. Warneken F, et al. Trends Cogn Sci. Show more similar articles See all similar articles.

Zhang Q, et al. Front Hum Neurosci. Evolution of egalitarian social norm by resource management. Wang X, et al. PLoS One. Chimpanzees Pan troglodytes tolerate some degree of inequity while cooperating but refuse to donate effort for nothing. Campbell MW, et al. Am J Primatol. Epub Jan 1. Oberliessen L, Kalenscher T. Oberliessen L, et al. Front Behav Neurosci.

Constant A, et al. Front Psychol. Show more "Cited by" articles See all "Cited by" articles. MeSH terms Animals Actions.

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Chimpanzees Are Rational Maximizers in an Ultimatum Game



Are Chimps More Rational than Humans?


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