I would expect schools in impoverished, troubled neighborhoods would cost QUITE a bit more than schools in wealthy neighborhoods in order to get the same result

I would expect schools in impoverished, troubled neighborhoods would cost QUITE a bit more than schools in wealthy neighborhoods in order to get the same results. The students are more likely to be facing food insecurity and odd parental schedules at home. The school may need to spend more keeping their student body safe. And one kid with a violent parent who reacts by being violent in turn can wreck havoc on the rest of the classroom. That kind of person might need an education that is more therapy than academic.