This paper investigates whether centralized admissions systems can alter school segregation. We take advantage of the largest school-admission reform implemented to date: Chile's SAS, which in 2016 replaced the country's decentralized system with a Deferred Acceptance algorithm. We exploit its incremental implementation and employ a Difference- in-Difference design. Using rich administrative student-level records, we find the effect of SAS critically depends on pre-existing levels of residential segregation and local school supply. For instance, districts with prominent provision of private education experience an uptick in school segregation due to SAS. Migration of high-SES students to private schools emerges as a key driver.
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