What drives social returns to education? A meta-analysis

Education can generate important externalities that contribute towards economic growth and convergence. In this paper, we study the drivers of such externalities by conducting the first meta-analysis of the social returns to education literature. We analyse over 1,000 estimates from 31 articles published since 1993 that cover 15 countries. Our results indicate that: 1) spillovers slow down with economic development; 2) tertiary schooling and schooling dispersion increase spillovers; 3) spillovers are smaller under fixed-effects and IV estimators but larger when measured at the firm level; and 4) there is publication bias (but not citation bias).