Matthew M. Chingos:

Advocates of expanding the educational options available to students from low-income families raise not only social justice arguments–pointing to the choices made by families that can afford to live close to a good public school or pay private-school tuition–but also the theory that competition induced by expanded school choice will be “the proverbial rising tide that lifts all boats.” Breaking the ironclad link between residence and school attended will, proponents argue, force schools to compete for students and resources in ways that increase the quality of education provided.
But critics of school choice policies argue that these reforms will lead to increased segregation by race and class as more motivated families move to better schools, leaving the most disadvantaged students behind in the worst public schools. Criticism has often focused on charter schools given the growth in the charter sector in recent years. Nationwide, charter enrollment grew from 1 to 3 percent of all students between 1999-2000 and 2009-10. Charters make up a much larger share of the market in several places, including 11 percent of Arizona students and 37 percent in the District of Columbia.