Why do we volunteer time? Why do we contribute money? Why, even, do we vote, if the effect of a single vote is negligible? Rationality-based microeconomic models are hard-pressed to explain such social behavior, but Howard Margolis proposes a solution. He suggests that within each person there are two selves, one selfish and the other group-oriented, and that the individual follows a Darwinian rule for allocating resources between those two selves.

"Howard Margolis's intriguing ideas . . . provide an alternative to the crude models of rational choice that have dominated economics and political science for too long."—Times Literary Supplement

Howard Margolis has held research and teaching appointments at the Massachusetts Institute of Technology, the Russell Sage Foundation, the Institute for Advanced Studies at Princeton, and the University of California, Irvine.