The paper gives an overview of primate research and the economic-ethical 'lessons' we can derive from it. In particular, it examines the complex, multi-faceted and partially conflicting nature of (non-) human primates. Our closest living relatives, the chimpanzees and bonobos, apparently walk on two legs: a selfish and a groupish leg. Given evolutionary continuity and gradualism between monkeys, apes and humans, human primates seem to be bipolar apes as well. They, too, tend to display a dual structure: there seems to be a pro-social and a self-interested side to our species and a bipolar tension seems to exist between competition and cooperation respectively between self-interest and the common good. We are apparently at the same time and . Our inner ape tries to combine self-interested and common good motives. Based on de Waal's , the essay investigates the evolutionary origins of morality and 'eusociality'. With the help of selected case studies stemming from behavioural sciences/economics, the paper illustrates examples of empathy, altruism, reciprocal fairness, pro-social and other-regarding preferences, inequity aversion and altruistic punishment in (non-)human primates. Beside this selfless and groupish side, the paper also reflects on the self-interest and egoistic nature of (non-)human primates and the behavioural and cognitive differences between monkeys, apes and humans.
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