For decades, urbanists have advocated for moving back downtown. Now, it's not simply a matter of lifestyle choice, or philosophy. It is starting to happen on a macro-scale, as a result of the economic downturn and of systemic changes in our social and economic geography. Richard Florida of the Atlantic writes about this phenomenon :

Suburbanization—and the sprawling growth it propelled—made sense for a time. The cities of the early and mid-20th century were dirty, sooty, smelly, and crowded, and commuting from the first, close-in suburbs was fast and easy. And as manufacturing became more technologically stable and product lines matured during the postwar boom, suburban growth dovetailed nicely with the pattern of industrial growth. Businesses began opening new plants in green-field locations that featured cheaper land and labor; management saw no reason to continue making now-standardized products in the expensive urban locations where they’d first been developed and sold. Work was outsourced to then-new suburbs and the emerging areas of the Sun Belt, whose connections to bigger cities by the highway system afforded rapid, low-cost distribution. This process brought the Sun Belt economies (which had lagged since the Civil War) into modern times, and sustained a long boom for the United States as a whole.

But that was then; the economy is different now. It no longer revolves around simply making and moving things. Instead, it depends on generating and transporting ideas. The places that thrive today are those with the highest velocity of ideas, the highest density of talented and creative people, the highest rate of metabolism. Velocity and density are not words that many people use when describing the suburbs. The economy is driven by key urban areas; a different geography is required.

Full article here.