One good turn deserves another Reciprocal altruism

An individual can increase its own fitness through reciprocal altruism, the situation in which altruistic acts are repaid. Forgot your lunch? No problem. I'll give you half of mine. But at some point in the future, I'll expect you to return the favor. Unlike kin selection (described in the earlier section), in which the good-deed-doer gets an immediate benefit, in reciprocal altruism, the benefit comes at some future time. In addition, reciprocal altruism can occur whether the individuals are genetically related or not.

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