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Nature 422, 125-126 (13 March 2003) | doi:10.1038/422125b

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Behavioural science: Fair's fair

Truman Bewley

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A basic theory of behaviour holds that people act only in their own best interests. But more complex motives are apparent in an experimental study that shows that generosity is diminished by the unfairness of others.

The rationality hypothesis brings order to much of the thinking in social sciences, and especially in economics. According to this hypothesis, people act solely to advance their own interests, interpreted in the most selfish way.