In this study, we test experimentally how a player who must decide how much money to transfer back in a trust game is affected by the experiment's monetary incentive. We find that positive reciprocity or altruism in a trust game is affected by the player's attachment to the money he received. We...

According to basic economic theory, people wish to maximize their expected utility. In order to do so they should integrate the likelihood (i.e. probability) and the possible outcomes (good or bad). Nevertheless, research has shown that people do not always account for their decisions on the...