Editing Smart growth (section)

===Urban growth boundaries===
Related to zoning ordinances, an [[urban growth boundary]] (UGB) is a tool used in some U.S. cities to contain high density development to certain areas. The first urban growth boundary in the United States was established in 1958 in Kentucky. Subsequently, urban growth boundaries were established in Oregon in the 1970s and Florida in the 1980s. Some believe that UGBs contributed to the escalation of housing prices from 2000 to 2006, as they limited the supply of developable land.<ref>{{cite web| url = http://econjwatch.org/articles/constraints-on-housing-supply-natural-and-regulatory/| title = Cox, Wendell. "Constraints on Housing Supply: Natural and Regulatory," ''Econ Journal Watch 8(1)'', 13-27.| date = 17 January 2011}}</ref> However, this is not completely substantiated because prices continued to rise even after municipalities expanded their growth boundaries.