Assertion: altruism | /r/CapableOf | evolve in the model
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text: What is needed for altruism to evolve, in the model above, is for the probability of having a partner of the same type as oneself to be sufficiently larger than the probability of having a partner of opposite type; this ensures that the recipients of altruism have a greater than random chance of being fellow altruists, i.e., donor-recipient correlation.