The Coevolution of Altruism, Parochialism and War - Santa Fe Institute
The Coevolution of Altruism, Parochialism and War - Santa Fe Institute
The Coevolution of Altruism, Parochialism and War - Santa Fe Institute
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Consider a population in which<br />
P T<br />
individuals may be either Altruistic (A)<br />
or Not (N) <strong>and</strong> either Tolerant (T) or A PA TA<br />
Parochial (P) towards other groups (these N NP NT<br />
are 4 behaviors, not preferences)<br />
• A’s contribute to the fitness <strong>of</strong> other group members at a<br />
cost to themselves<br />
• Only the PA’s fight wars.<br />
• P’s induce hostilities <strong>and</strong> forgo the benefits <strong>of</strong> peaceful<br />
interactions with other groups enjoyed by the T’s<br />
• In every group Tolerant beats Parochial <strong>and</strong> Not beats<br />
Altruist<br />
• So (the key point): NT is the dominant strategy, the other 3<br />
types will be eliminated; both P’s <strong>and</strong> A’s are doomed.<br />
• <strong>War</strong> to the rescue!
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