“…On the theoretical side, there is a growing literature that focuses on the hierarchical nature of the education process, namely the human capital output from an earlier stage is an input for human capital accumulation and improves the learning effectiveness at a subsequent stage of education (see, for example, Ben-Porath, 1967;Lucas, 1988;Driskill and Horowitz, 2002;Su, 2004Su, , 2006Blankenau, 2005;Blankenau et al, 2007;Cunha and Heckman, 2007;Gilpin and Kaganovich, 2012). More specifically, a few of these studies (Su, 2004(Su, , 2006Gilpin and Kaganovich, 2012;Kaganovich and Su, 2015) focus on the role of a curricular threshold as an important determinant in the education technology, and derive the implications of such a threshold on the aggregate efficiency and distributional equality.…”