Student Demographics, Teacher Sorting, and Teacher Quality: Evidence from the End of School Desegregation
利用夏洛特-梅克伦堡学区结束校车接送后学生重新分配的自然实验，研究发现黑人学生回流导致教师质量下降，且这种关联主要由劳动力供给变化驱动。
The reshuffling of students due to the end of student busing in Charlotte-Mecklenburg provides a unique opportunity to investigate the relationship between changes in student attributes and changes in teacher quality that are not confounded with changes in school or neighborhood characteristics. Comparisons of ordinary least squares and instrumental variable results suggest that spatial correlation between teachers' residences, students' residences, and schools could lead to spurious correlation between student attributes and teacher characteristics. Schools that experienced a repatriation of black students experienced a decrease in various measures of teacher quality. I provide evidence that this was primarily due to changes in labor supply. (c) 2009 by The University of Chicago.