3. Teach people to care about each other
An excellent way to promote cooperation in a society is to teach people to care about the welfare of others. Parents and schools devote a tremendous effort to teaching the young to value the happiness of others.

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Quote text and notes from Wikiquote: Robert Axelrod (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.