The Evolution of Cooperation: Revised Edition

"Prisoners Dilemma: .... There’s a much better outcome available if they could figure out the coordination, but coordination is hard."

The results were clear: high-IQ individuals in general cooperated more in these games, and IQ mattered the most in games where there were trade-offs between short-run goals and longer-run considerations. The researchers put it this way: in this situation, “intelligence matters substantially more in the long run than other factors and personality tr

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