Some commentators treat suburban sprawl (by which I mean automobile-dependent land development) as the result of the free market at work. This article reviews City Rules, by urban planning professor Emily Talen. In this book, Talen shows not only how zoning and similar land use regulations generate automobile-dependent suburban sprawl, but also how these regulations have become stricter, more pro-sprawl, and more complex over time. Talen proposes to reform these regulations through municipal codes that promote more walkable, less automobile-dependent development.