Parents in rich areas, and kids in poor areas, according to teachers I know. I suspect "best teachers" introduces a selection bias for particular districts or p

Parents in rich areas, and kids in poor areas, according to teachers I know. I suspect "best teachers" introduces a selection bias for particular districts or private schools. It's kind of a choose your poison situation... either hyper-entitled parents (e.g. correcting a properly graded test to the point of claiming 2+2*2 = 8 was actually the correct answer), or kids that are at best on their phone all day, and at worst bring guns and drugs to school.