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(From: “A Win-Win Solution: The Empirical Evidence on How Vouchers Improve Public Schools”
(Note: A total of 17 studies are represented here; figures do not sum to 17 because some studies include findings on more than one program.)
The only study that showed no difference was for Washington, DC, where the voucher program includes rules that largely eliminate the potential competition aspects of vouchers for public schools.
Find the Friedman study here.