.g., discounting, risk aversion and altruism) and most cultural traits, social norms, and ideological tenets ( e.g., attitudes towards …

an anonymous treatment where neither player is told at the end of the experiment which decision was selected for payment … future. We can decompose altruistic preferences into baseline altruism towards any partner and directed altruism towards … friends. Decision makers vary widely in their baseline altruism, but pass at least 50 percent more surplus to friends compared …