Reciprocity (social psychology) - Wikipedia
https://en.wikipedia.org/wiki/Reciprocity_%28social_psychology%29
In social psychology, reciprocity is a social norm of responding to a positive action with another positive action, rewarding kind actions. As a social construct, reciprocity means that in response to friendly actions, people are frequently much nicer and much more cooperative than predicted by the self-interest model; conversely, in response to hostile actions they are frequently much …
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