This paper examines the effects of sorting and mixing on academic performance of high school students in South Korea. The Korean government has vigorously promoted mixing for more than three decades, replacing competitive entrance examinations at individual schools by a lottery-based enrollment...

We investigate the effects of attending a single-sex high school on future labor market outcomes through use of a randomized natural experiment. South Korean students are randomly assigned, by lottery, to single-sex or co-educational schools within their school districts. Using a large set of...