I study the effect of coeducation on academic performance and science course enrollment using student-level data from a South Korean high school that, at the beginning of each academic year, quasi-randomly assigned students to either single-sex or coeducation classrooms. This paper presents two main findings. First, among girls with high…

Some U.S. school districts are experimenting with single-sex schooling, hoping that it will yield better academic outcomes for students. Empirical research on the effects of single-sex schooling, however, has been equivocal, with various studies finding benefits, disadvantages, or no effect. Most of this research is marred because families…