Chris Correa asks a good question about charter schools: where is the evidence that competition from charters improves all schools?

However, proponents often point out that school competition will lead to improved education in all public schools. This is an attractive notion, but it seems difficult – if not impossible – to prove. Trusting free markets to improve schooling is, in a way, an act of faith.

He links to a recently published study which comes to the conclusion that there was no evidence that charter schools had any affect on the test scores of neighboring public schools. Chris, however, correctly notes that these results don’t settle the issue. "Free-market schooling" needs a whole lot more study.