In the United States, private school is generally a privilege of the rich. But in poorer nations, particularly in Africa and South Asia, families of all social classes send their children to private school. The private schools within reach of the poor, however — usually a single classroom a woman runs in her house — are not a big improvement. But two school systems — Bridge International Academies in Kenya and BRAC in Bangladesh — are offering something different: they are making decent education accessible to the world’s poorest on a giant scale.

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