Mutual benefit can promote the evolution of preferential interactions and in this way can lead to the evolution of true altruism.

Abstract excerpt

We analyse the evolution of the assortment of encounters through active choice of companions among individuals that interact cooperatively in a situation of mutual benefit. Using a simple mathematical model, we show that mutual benefit can favour the evolution of a preference to interact with individuals that are similar to themselves with respect to an arbitrary tag even when both the preference and the tag...

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