“…We contribute to two strands of literature: first, we contribute to the economic literature on the external, non-monetary effect of education on civic engagement, which focuses on the effect of years of education on predominantly political interest, information, and participation (Dee, 2004;Dhillon and Peralta, 2002;Milligan et al, 2004;Pelkonen, 2012;Siedler, 2010), as well as reciprocity (Fehr and Gachter, 2000;Kosse et al, 2014). 5 Here, the study most closely related to ours is Gibson (2001): the author uses a sample of twins to hold unobservable family characteristics constant, showing that more years of education are associated with a lower probability of volunteering and supply of volunteer hours.…”