Are the Suburbs Where the American Dream Goes to Die? (Matthew O'Brien, The Atlantic)

The suburbs didn't quite kill the American Dream, but a particular type did. That's the low-density and racially-polarized suburbs that have defined places like Atlanta. Indeed, as you can see in the chart below from Paul Krugman, there's a noticeable relationship between a metro area's density and its social mobility.

In Climbing the Income Ladder, Location Matters   (David Leonhardt, NY Times)