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This article focuses on the exclusionary effects of land use regulation on housing availability and cost. Recent research by economists and others highlighting such effects is examined. The histories of parallel efforts to provide housing for low- and moderate-income families as well as persons with disabilities are reviewed. The article recommends that legislation be enacted that elevates affordable housing for low- and moderate-income to a level of national concern similar to national policies favoring efficient transportation, as well as protecting coastal and wetland areas and endangered species.