Choice quote which does a good job of summarizing what I have seen:

“In addition, the differential direct and indirect effects of income on high school achievement and, in turn, high school achieve-ment on SAT scores may also be explained in terms of residential racial and economic segregation which are, through property values and taxpolicies, related to the quality of schooling. Moreover, the poverty effects reported here suggest the lack of social and educational resources in the larger community that are needed to supplement and complement the learning taking place in schools.”