One good way to sum up the concept of the norm of reciprocity might be the old saying:

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The norm of reciprocity is based on the idea that people feel a sense of obligation to return favors or kindness that has been shown to them. This is similar to the saying "there's no such thing as a free lunch," which suggests that everything has a cost and that favors or kindness given come with an expectation of something in return.

One Good Way to Sum Up the Concept of the Norm