Escolas privadas reduzem diferenças sociais

É evidente - para quase todos - que alunos têm, em média, melhores notas se ingressarem numa escola privada. E, nos EUA, a melhoria é ainda maior se o aluno for negro:

A recent analysis of national test score data suggests private schools do a better job than public schools of closing the achievement gap between black and white students as they progress from fourth to 12th grades.
(...)
Averaged across subjects, the public school racial achievement gap is virtually unchanged between fourth and 12th grades. By contrast, the gap in private schools is an average of 27.5 percentage points smaller in the 12th grade than the fourth.

The achievement gap closes faster in private schools not because white private school students lose ground with respect to white public school students as they move to higher grades, but because black private school students learn at a substantially higher rate than black public school students.

(in Heartland Institute, via Education Watch)

O artigo também refere a eficiência dos programas de vouchers junto das comunidades menos favorecidas.