There is a scene early in the 2006 mockumentary Radiant City that provides the key explanation to the morphology of suburban sprawl. Our favorite writer James Howard Kunstler sits on a bench in a community bike trail that is enclosed in two rows of chain link fence in order to, I presume, secure it from the high-capacity arterial road that runs alongside it. The experience is vaguely what it must have been like to patrol the Berlin Wall, had it been encircled by an expressway.

Almost half of Americans want to live somewhere else. Even for a nation known for its exceptional mobility, the fact that people are not only moving in pursuit of employment opportunities but are looking to move simply because they hate the place they live in reveals a much deeper problem. Economic opportunity is no longer what keeps people moving, it is what keeps them immobilized. Given the same opportunity they would relocate to the kind of place where life is good.