many people in the position of person B will reject the deal out of being offended by unfairness. In contrast, a chimpanzee playing a similar game (using raisins as the object of value rather than U.S. dollars) will rarely reject that deal.8 To a chimp, forgoing raisins is just silly. The moral of the story is to never underestimate a person’s sense of fairness; it is overwhelming enough that he often may sacrifice his own self-interest for its sake. (The other moral of the story is to never count on a chimpanzee giving you a fair deal. Nor an elephant,
