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...

Increasing the attractiveness of voting is often seen as a remedy for unequal par- ticipation and the influence of special-interest groups on public policy. However, lower voting costs may also bring less informed citizens to the poll inviting efforts to sway these voters. We substantiate this...

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...