Of course innate capacity has something to do with how much or how well any individual student can learn. But there is a world of difference between a well-run

Of course innate capacity has something to do with how much or how well any individual student can learn. But there is a world of difference between a well-run school and a poorly-run school. In the simplest comparison, a well-run school is a relatively safe place, and a poorly-run school is an extremely unsafe place. If you take students from some of the more well-run schools and place them into poorly-run schools, most of them will learn very little. If you take students from some of the more poorly-run schools and place them into well-run schools, many of them will learn quite a lot.