DP10345 Spillovers of Prosocial Motivation: Evidence from an Intervention Study on Blood Donors
|Author(s):||Adrian Bruhin, Lorenz Goette, Simon Haenni, Lingqing Jiang|
|Publication Date:||January 2015|
|Keyword(s):||bivariate probit, blood donation, prosocial motivation, social interactions|
|JEL(s):||C31, C36, D03|
|Programme Areas:||Public Economics|
|Link to this Page:||cepr.org/active/publications/discussion_papers/dp.php?dpno=10345|
Spillovers of prosocial motivation are crucial for the formation of social capital. They facilitate interactions among individuals and create social multipliers that amplify the effects of policy interventions. We conducted a large-scale intervention study among dyads of blood donors to investigate whether social ties lead to motivational spillovers in the decision to donate. The intervention is a randomized phone call making donors aware of a current shortage of their blood type and serving us as an instrument for identifying motivational spillovers. About 40% of a donor's motivation spills over to the other donor, creating a significant social multiplier of 1.78.