Here is communist Freddie DeBoer agreeing with Libertarians; Arnold Kling, Bryan Caplan and me on school quality:
Indeed, I am on record as saying that I don’t think there’s really such a thing as school quality, and that while teacher quality may be a real and meaningful variable it is likely confounded to hell and there may be interaction effects.
There are not a significant number (more than 0.1%) of schools in the developed world that are significantly (10%) worse that the rest. We could save a lot of money if we admit that. You could use the saving to help the poorest among us if you chose.