It is generally believed that the increased incidence of homelessness in the United States has arisen from broad societal factors, such as changes in the institutionalization of the mentally ill, increases in drug addiction and alcohol usage, and so forth. This paper presents a comprehensive test of the alternate hypothesis that variations in homelessness arise from changed circumstances in the housing market and in the income distribution. We assemble essentially all the systematic information available on homelessness in U.S. urban areas: census counts, shelter bed counts, records of transfer payments, and administrative agency estimates. We estimate similar statistical models using four different samples of data on the incidence of homelessness, defined according to very different criteria. Our results suggest that simple economic principles governing the availability and pricing of housing and the growth in demand for the lowest-quality housing explain a large portion of the variation in homelessness among U.S. metropolitan housing markets. Furthermore, rather modest improvements in the affordability of rental housing or its availability can substantially reduce the incidence of homelessness in the United States.

Rapidly rising homelessness in the 1980s shocked Americans and led to a flurry of studies, a deluge of news stories, and to Public Law 100-77, the Stewart B. McKinney Homeless Assistance Act of July 1987. The McKinney Act marked the entrance of the federal government into homelessness policy, which, until then, had been a purely local issue. A dozen years later, housing the homeless remains a recurrent political issue in many cities in California. Improving the quality of life of those without a regular and decent place to spend the night rests primarily with a multitude of nonprofit organizations. Meagerly funded by all levels of government, they must not only house the homeless but must also attend to their many personal problems. While a multifaceted approach is probably required to eliminate the homelessness problem, in California homelessness might be substantially reduced with modest policy changes attacking the problem in the most obvious way: by adding to the stock of adequate housing accessible to the poor. We explore options that aim to do exactly that in this monograph.

In this paper, we use a general equilibrium simulation model to assess the potential impacts on homelessness of various housing-market policy interventions. We calibrate the model to the four largest metropolitan areas in California. We explore the welfare con- sequences and the effects on homelessness of three housing-market policy interventions: extending housing vouchers to all low-income households, subsidizing all landlords, and subsidizing those landlords who supply low-income housing. Our results suggest that a very large fraction of homelessness can be eliminated through increased reliance upon well-known housing subsidy policies.