laboratory experiments with 645 subjects at a trucker training program in the Midwestern US. The experiment use a version of the …There is by now ample evidence from laboratory experiments that individuals exhibit "prosocial" or "other …). In this paper we address this question by using a measure of costly cooperation elicited in a laboratory experiment to …

-month large-scale field experiment and a fifteen-month follow-up period, involving more than 10,000 previous donors. We examine … offer of a lottery ticket, on average, increases the probability to donate blood during the experiment by 5.6 percentage … reduction in donations is observed after the experiment. …

Does social recognition motivate prosocial individuals? We run large-scale experiments at Italy's main blood donors … ask to donate is at least as effective as offering social recognition. A survey experiment with blood donors indicates …

behavioral change. In a field experiment with around 1,000 participants, we directly observe the interventions' effects on …