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The social norm of reciprocity is the expectation that people will respond to each other in similar ways—responding to gifts and kindnesses from others with similar benevolence of their own, and responding to harmful, hurtful acts from others with either indifference or some form of retaliation. Such norms can be crude and mechanical, such as a literal reading of the eye-for-an-eye rule lex talionis, or they can be complex and sophisticated, such as a subtle understanding of how anonymous donations to an international organization can be a form of reciprocity for the receipt of very personal benefits, such as the love of a parent.
The norm of reciprocity varies widely in its details from situation to situation, and from society to society. Anthropologists and sociologists have often claimed, however, that having some version of the norm appears to be a social inevitability.[1] Reciprocity figures prominently in social exchange theory,[2] evolutionary psychology, social psychology,[3] cultural anthropology and rational choice theory.[4]