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 use people, even if it benefits them to be used, as Kant intoned in his second formulation of the categorical imperative: “Act in such a way that you treat humanity, whether in your own person or in the person of any other, never merely as a means to an end, but always at the