Summary
The role of self-interest in human generosity
How are altruism and self-interest linked in human generosity? The origins of generosity are explored
by combining biological, anthropological and sociological evidence. Reciprocity proves to be a major
factor in explaining the evolution of cooperation and altruism, both in animals and in human
beings. Empirical research shows that human generosity is selective: kin and close relatives are favoured
over others. Moreover, generosity generates its own rewards and is therefore again selective: the
more you give, the more you receive.