The Evolution of Altruism Among Non-Relatives

Brett Weinstein: We don't need group selection now because we can explain altruism with inclusive fitness. At that time it was confined to genealogical relatives. But individual selectionists had an answer to that too. Bob Trivers came along with reciprocal altruism. And so once again, the idea there is I scratch your back, you scratch mine. Is that altruism can pay if there's a return benefit?

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