The concept of segregation in U.S. neighborhoods has shifted from race-based separation to economic, a study of census data by Northwestern University has revealed

The Institute for Policy Research at the Illinois school said that black and Hispanic residents of poor neighborhoods often have neighbors from other ethnic groups who also are struggling to get by. "Nationally there is evidence that as racial segregation has been slowly going down that income segregation has been going up," sociology Professor Lincoln Quillian said in a written statement. "Blacks and Hispanics often are co-residing with poorer members of their racial groups." Quillian said the research, which was based on the 2000 census, indicates that changes are necessary for academics and urban policymakers seeking to eliminate local pockets of poverty, including a shift away from seeing segregation as simply a color-based issue.