Comment by insane_dreamer

Yeah, fair point.

I don't know whether budgets change school quality, but there is a marked difference in most cities between schools with high and low performance outcomes as measured by test scores, graduation rates, etc. (not that test scores are the best measure of life in general, but they're what's available in terms of academic understanding). And if you look at the schools with high ratings and where they are located, you'll find that it correlates greatly with income, and even more so you'll find that schools with the lowest performance correlate greatly with low income. (These are averages; there are brilliant students at all these schools.)

Families with higher income have more resources and more ability to support their child's education (after school activities, tutoring, a more academically-oriented environment, and most importantly, the absence of financial stress on the family unit which can greatly affect children especially if the parents (or in many cases a single parent household) has to work multiple jobs just to put food on the table much less be able to handle much else.