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Reply to Jensen et al.: Equitable offers are not rationally maximizing

When playing the ultimatum game, chimpanzees and children shifted their behavior from selfish offers in the preference test to more equitable ones in the ultimatum game (1). Why did they do so? All that we can measure is behavior, not motivations. Nonetheless, in human studies equitable outcomes are interpreted as reflecting a sense of fairness, thus this explanation must be considered for the apes as well. Given the genetic similarity between both species, shared explanations are the most parsimonious from an evolutionary perspective. Indeed, Jensen et al. (2) offer no alternative and ignored the similar responses of the children in our study.