“…Systematic under-reporting of estimates with the 'wrong' sign drives the global mean in the opposite direction. This distortion of reported results is a frequently reported phenomenon in economic research (for example, among other studies, Havranek andIrsova, 2011, 2012;Doucouliagos and Stanley, 2013;Rusnak, Havranek and Horvath, 2013;Havranek et al, 2015b;Havranek and Kokes, 2015;Ioannidis, Stanley and Doucouliagos, 2017). Studies addressing the law of demand are frequently affected by publication selection, but other areas also suffer from bias, with the economics of education being no exception: Fleury and Gilles (2015) report publication bias in the literature on the inter-generational transmission of education, Ashenfelter, Harmon and Oosterbeek (1999) find bias in the estimates of the rate of return to education, and Benos and Zotou (2014) report bias towards a positive impact of education on growth.…”