but public school financing mainly through property tax levied by individual school districts is major contributor to the educational caste system...amount of money available to school reflects property values within a district's boundaries...so amount of money available is closely correlated with spatial sorting out of economic activities and socioeconomic and racial groups...public schools that are able to spend most on education are generally located in white suburbs... wedding school quality to parental wealth makes the educational system an elaborate scheme for preserving existing inequalities... Michael Hoover