Do single-sex schools make girls less interested in predominantly male majors?

This study estimates the impact of single-sex schooling on the gender gap in students' choice of college major. Potential endogeneity concerns are mitigated by homogeneous application behavior under the Boston mechanism-type assignment into high schools and college-major-specific admissions policies in South Korea. Single-sex schooling is found to widen the gender gap in the choice of predominantly male majors by attracting girls to gender-balanced majors and boys to predominantly male majors. Recruiting more male mathematics and science teachers, while maintaining the share of female teachers at a certain level, could encourage girls in single-sex schools to pursue predominantly male majors.