“…After that, we turn to MTE estimation as a more informative way of exploiting a continuous instrument, which aims at identifying a 3 Applications in economics of education range from estimating the effects of child care attendance on child performance (Felfe and Lalive, 2015, Noboa-Hidalgo and Urzúa, 2012, and Cornelissen, Dustmann, Raute, and Schönberg, 2016, the effects of secondary schooling attendance on earnings (Carneiro, Lokshin, Riado-Cano, and Umapathi, 2015), the effects of advanced high school mathematics education on earnings (Joensen and Nielsen, 2016), the effects of mixed-ability schools on long-term health (Basu, Jones, and Rosa Dias, 2014), the effects of alternative breast cancer treatments on medical costs (Basu, Heckman, Navarro-Lozano, and Urzúa, 2007), and the returns to attending college (see e.g. Carneiro, Heckman, and Vytlacil, 2011 for the U.S., Balfe, 2015 for the U.K., Kamhöfer, Schmitz, andWestphal, 2015, for Germany, andNybom, 2014, for Sweden as well as Kaufmann, 2014, on the role of credit constraints in Mexico).…”