“Many theories have been advanced to explain racial gaps in performance, of which these are the most common: black and Hispanic schools do not get enough money, their classes are too big, students are segregated from whites, minorities do not have enough teachers of their own race. Each of these explanations has been thoroughly investigated. Urban schools, where non-whites are concentrated, often get more money than suburban white schools, so blacks and Hispanics are not short-changed in budget or class size. Teacher race has no detectable effect on learning (Asians, for example, outperform whites regardless of who teaches them), nor do whites in the classroom raise or lower the scores of students of other races.
Money is not the problem. From the early 1970s to the 2006-2007 school year per-pupil spending more than doubled in real terms. The Cato Institute calculates that when capital costs are included, the Los Angeles School District spends more than $25,000 per student per year, and the District of Columbia spends more than $28,000.
Neither district gets good results. Demographic change can become a vicious cycle: As more minorities and immigrants enter a school system average achievement falls. More money and effort is devoted to these groups, squeezing gifted programs, music and art, and advanced placement courses. The better-performing students leave, and standards fall further.”