Reminder: when other groups act collectively against you and you act individually, you lose. See https://egtheory.wordpress.com/2013/06/30/how-ethnocentrics-rule/ …
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In the simulation there I think they pitted tit-for-tat vs. a group that recognized each other and cooperated vs. other strategies.
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The "recognize and cooperate" group unsurprisingly wins, at least until they become more vulnerable to smaller group defection
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So, they succeeded until they failed. So, not a stable strategy even in that experiment.
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Oh they didn't model the splitting down the line as far as I can tell. Too complicated for this simulation.
End of conversation
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You cooperate more in situations where reciprocity is guaranteed by the state, such as your employer, than you do even with close relatives.
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