Imagine, for example, four people playing a game in which contributions are doubled. If everyone contributes their $10, they all end up with $20. But a player who refuses to contribute while the others put in the full amount ends up with $25 while the rest get $15 each. If only one player contributes their $10, they end up with just $5 and everybody else $15. The self-interested thing to do, therefore, is never to contribute.
Source: http://feeds.slate.com/click.phdo?i=3528be80b100418b8687e440cbabd5f0
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