While I'd recommend looking up some info on the topic, the short answer is "us."

Just like you can choose which supermarket to shop in, in theory there'd be enough choices for schools for the free market to supply the need. It sounds insane because it's not how Americans think about education today. We've been taught to think that the government should provide education, but it presents a lot of problems, especially in poor areas (whether heavily rural or inner city).

But think for a second about how much home value is tied into school district. Think about how colleges prefer students from the "good districts." Are we really all getting equal education and equal opportunity?

I personally don't belive an entirely free market education system is best. I agree with a common argument that when profits are the only motive, essential services like a education, health care, etc can focus on the wrong things and I'm some cases completely miss the mark.

But that doesn't mean our current system is better, and I'm open to all ideas for how to make it better. I've come to think that a private system with a safety net would be best for both education & healthcare. But my personal opinion is another discussion.