James Tooley writes in Private Schools for the Poor:
The accepted wisdom is that private schools serve the privileged; everyone else, especially the poor, requires public school.
The poor, so this logic goes, need government assistance if they are to get a good education, which helps explain why, in the United States, many school choice enthusiasts believe that the only way the poor can get the education they deserve is through vouchers or charter schools, proxies for those better private or independent schools, paid for with public funds.
But if we reflect on these beliefs in a foreign context and observe low-income families in underprivileged and developing countries, we find these assumptions lacking: the poor have found remarkably innovative ways of helping themselves, educationally, and in some of the most destitute places on Earth have managed to nurture a large and growing industry of private schools for themselves. [“Private Schools for the Poor“, The Catholic Education Resource Center]