altruism, reputational concerns, and material incentives. We present an analysis of a unique data set that combines an … experimental measure of altruism, surveyed measures of other factors including reputational concerns, and call records from … explanations, we find that altruism and reputational concerns are positively associated with the decision to volunteer. Moreover …

) and therefore subjects self-selected into the experiment. Because the structure of their training program reduced the …-selected adults and the adult trainees, suggesting that selection into this type of experiment is unlikely to bias inferences with …