There is a longstanding concern that material rewards might undermine pro-social motivations, thereby leading to a decrease in blood donations. This paper provides an empirical test of how material rewards affect blood donations in a three-month large-scale field experiment and a fifteen-month...

In many European countries, there is an unmissable trend towards stricter tobacco control policies and a parallel reduction in the prevalence of smoking. The extent to which policies promote this latter trend, however, is less clear. We therefore analyze the staggered introductions of smoking...

There is a longstanding concern that material incentives might undermine prosocial motivation, leading to a decrease in blood donations rather than an increase. This paper provides an empirical test of how material incentives affect blood donations in a large-scale eld experiment spanning three...