Game Theory and Morality Moshe Hoffman, Erez Yoeli, and Carlos David Navarrete Introduction Consider the following puzzling aspects of our morality: 1. Many of us share the view that one should not

Cooperate without looking: Why we care what people think and not just what they do Moshe Hoffman', Erez Yoeli', and Martin A. Nowak' I' •Peogram for Evolutionary Dynamics, Oeparunent of Mathematics and 'Department of Organismic and Evolutionary Biology, Harv