In the second edition of his report "A Win-Win Solution: The Empirical Evidence on School Vouchers," Greg Forster "collects the results of all available empirical studies using the best available scientific methods to measure how school vouchers affect academic outcomes for participants, and all available studies on how vouchers affect outcomes in public schools. Contrary to the widespread claim that vouchers do not benefit participants and hurt public schools, the empirical evidence consistently shows that vouchers improve outcomes for both participants and public schools." Among the report's key findings:
- Ten empirical studies have used random assignment, the gold standard of social science, to examine how vouchers affect participants. Nine studies find that vouchers improve student outcomes, six that all students benefit and three that some benefit and some are not affected. One study finds no visible impact. None of these studies finds a negative impact.
- Nineteen empirical studies have examined how vouchers affect outcomes in public schools. Of these studies, 18 find that vouchers improved public schools and one finds no visible impact. No empirical studies find that vouchers harm public schools.
- Every empirical study ever conducted in Milwaukee, Florida, Ohio, Texas, Maine and Vermont finds that voucher programs in those places improved public schools.
- Only one study, conducted in Washington D.C., found no visible impact from vouchers. This is not surprising, since the D.C. voucher program is the only one designed to shield public schools from the impact of competition. Thus, the D.C. study does not detract from the research consensus in favor of a positive effect from voucher competition.
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