Charter Schools: A Copper Bullet?

A new report on KIPP charter schools is encouraging. Drum calls KIPP is a "limited success":

KIPP schools demand a lot of their teachers, who work very long hours
and are required to be on call at all times. They pay a bit more for
this, but only a bit, and this isn't a model that scales well. You can
always find a small cadre of dedicated young teachers willing to put up
with this, but you're never going to find the hundreds of thousands
you'd need to make this work on a large scale.

Yglesias ...