This paper considers environments in which the population consists of a mix of altruists and egoists, and asks under what situations do altruists have a disproportionately large effect on equilibrium, and under what situations is it the egoists. We begin by presenting a general framework for answering this question.
The Role of Altruism in Economic InteractionJohn C. Haltiwanger and Michael Waldman ,
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Journal of Economic Behavior and Organization