produce output under uncertainty, and siblings may transfer output to each other. We show that altruism has a non …-monotonic effect on effort. Equilibrium effort decreases (increases) with altruism at low (high) levels of altruism. We study how this … climates than in harsher climates, and that the evolutionarily robust degree of altruism is positive but less than one half …

-linked individuals take to avoid an accident increases with the degree of altruism. If the degree of altruism is sufficiently high, an … economy with nonmarket insurance yields higher social welfare than an economy without nonmarket insurance. As altruism …

from patient interests, especially when providers are motivated more by profits than by altruism. We investigate how profit …