Richard Florida offers a very interesting analysis in this month’s Atlantic showing a (somewhat alarming) demographic realignment in America’s metro areas — a “geographic sorting of people by economic potential” that he dubs “the means migration.”
In short, the most “highly skilled, highly educated, and highly paid Americans” are clustering in a small number of metro areas, while those same areas are seeing “a corresponding exodus of the traditional lower and middle classes.”
It’s a thought-provoking piece (which, alas, isn’t available online without a subscription. But you can see a key chart here.) UPDATE (9/18, 8pm EDT): Joe Auer informs me that Florida has posted a PDF of the article here.