School Choice, Student Sorting, and Academic Performance
利用罗马尼亚城镇间学校数量的差异，研究发现更多学校选择加剧了学生按入学分数分层，拉大了高低分学生间的成绩差距，但并未提高平均学业水平。
Abstract This study examines the impact of school choice on academic achievement. I use differences in the number of schools across similar Romanian towns, generating variation in school choice for local students, who compete for seats via test scores. I find that more school choice results in increased sorting of students by admission scores across different schools. Sorting widens achievement gaps between high- and low-admission score students. High-scorers having access to better teachers and peer effects are the primary factors explaining these widening gaps. Lastly, between-school competition via school choice does not increase average achievement levels.