Opponents of school choice are running out of excuses as evidence continues to roll in about the positive impact of charter schools.
Stanford economist Caroline Hoxby recently found that poor urban children who attend a charter school from kindergarten through 8th grade can close the learning gap with affluent suburban kids by 86% in reading and 66% in math. And now Marcus Winters, who follows education for the Manhattan Institute, has released a paper showing that even students who don't attend a charter school benefit academically when their public school is exposed to charter competition.
Mr. Winters focuses on New York City public school students in grades 3 through 8. "For every one percent of a public school's students who leave for a charter," concludes Mr. Winters, "reading proficiency among those who remain increases by about 0.02 standard deviations, a small but not insignificant number, in view of the widely held suspicion that the impact on local public schools . . . would be negative." It tuns out that traditional public schools respond to competition in a way that benefits their students.