I support school choice - but it's complicated.

I live in Washington, D.C., where almost half of the city's students attend charter schools. I helped launch a charter school here. My son attends another one, and the city is beginning to see some real collaboration between its charter schools and the district. Good things are happening.

At the same time, I worry about what might happen if too many of us simply assume that the invisible hand of the modern school marketplace - or, worse still, the incentivizing hand of the modern school official - is a sufficient strategy for ensuring that all children receive equal access to a high-quality public education.

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