People with college degrees cluster together in same cities

Apparently people like to live in areas with people like themselves, surprise.  From the NY Times:

Just 24 percent of the adult residents of metropolitan Dayton have four-year degrees, well below the average of 32 percent for American metro areas, and about half the rate of Washington, the country’s most educated metro area, according to a Brookings Institution analysis. Like many Rust Belt cities, it is a captive of its rich manufacturing past, when well-paying jobs were plentiful and landing one without a college degree was easy.
Educational attainment lagged as a result, even as it became more critical to success in the national economy. “We were so wealthy for so long that we got complacent,” said Jane L. Dockery, associate director of the Center for Urban and Public Affairs at Wright State University here. “We saw the writing on the wall, but we didn’t act.”
Dayton sits on one side of a growing divide among American cities, in which a small number of metro areas vacuum up a large number of college graduates, and the rest struggle to keep those they have.
The winners are metro areas like Raleigh, N.C., San Francisco and Stamford, Conn., where more than 40 percent of the population has a college degree. The Raleigh area has a booming technology sector and several major research universities; San Francisco has been a magnet for college graduates for decades; and metropolitan Stamford draws highly educated workers from white-collar professions in New York like finance. . . .