cost-benefit ratio (CBR). There are indeed only two stable sets of equilibria enabling cooperation, one for low CBRs …-order discriminators which highlights the necessity for higher-order information to sustain cooperation through indirect reciprocity. In a … laboratory experiment, we find that more than 75% of subjects play strategies that belong to the predicted equilibrium set …

Most current attempts to explain the evolution - through individual selection - of pro-social behavior (i.e. behavior … benefits are, and it will be favoured by evolution as long as the benefits exceed the costs. We show with computer simulations …

same year Darwin published The Descent of Man, which emphasized sympathy and cooperation as well as self-interest, and …