Homelessness is a Housing Problem (with Gregg Colburn)

Episode Summary

Executive Summary: The episode argues that homelessness is primarily driven by housing scarcity and high rents, not simply addiction, mental illness, weather, or welfare generosity. Greg Colburn explains that community-level homelessness tracks absolute rent levels and vacancy rates, making housing supply and affordability the central policy levers. The conversation also covers market reforms, zoning, subsidies, and public/decommodified housing as necessary parts of a long-term solution.

Main Topics: Homelessness as a housing problem (Priority: 5/5): Colburn and the hosts emphasize that homelessness is best understood at the community level as a consequence of scarce, expensive housing rather than as a direct result of individual pathologies alone. Debunking common explanations (Priority: 5/5): The discussion systematically rejects weather, drug use, mental illness, welfare benefits, and policing/sweeps as primary explanations for geographic differences in homelessness. Absolute rents and vacancy rates (Priority: 5/5): The strongest explanatory variables identified are median gross rent and rental vacancy rates; higher rents and tighter markets correspond to more homelessness. Why cost burden is misleading (Priority: 4/5): The episode argues that relative housing cost burden is less predictive than absolute rent, because markets and wages adjust together across cities. Policy and market solutions (Priority: 5/5): Solutions include zoning reform, faster permitting, more supply, expanded rental assistance, and more housing outside the private market. Limits of market-only approaches (Priority: 4/5): Colburn argues the private market alone cannot solve affordability at scale, especially in high-cost cities; public or nonprofit housing is needed alongside market production. Federal versus local responsibility (Priority: 4/5): The episode stresses that federal housing policy created much of the problem, but state and local governments also intensified it through restrictive land use and insufficient building.

Key Arguments: Homelessness is highly correlated with housing scarcity and high absolute rents, not with the prevalence of addiction or mental illness in a place. Individual risk factors like addiction, mental illness, and poverty increase a person’s risk of homelessness, but they do not explain why some cities have much higher homelessness than others. Weather does not explain regional differences in homelessness; cold cities can have high homelessness and warm cities can have low homelessness. Generous welfare benefits do not appear to attract large numbers of unhoused people across state lines; most homelessness is homegrown. The strongest market indicators associated with homelessness are high rents and low vacancy rates, which signal insufficient housing supply. Housing cost burden is not the best explanatory measure because cities with low rents can still have high burdens if incomes are very low, while expensive cities may have similar burden rates. Seattle’s zoning, topography, and regulatory constraints make housing supply inelastic, worsening the impact of a tech-driven demand surge. The private market alone cannot likely solve the problem; permanent affordable/decommodified housing and subsidies are needed. Federal investment in rental assistance and local investment in housing capacity would allow people to use vouchers effectively. Veteran homelessness shows that homelessness can be dramatically reduced when government prioritizes housing plus services and funds it at scale.

Data Points: Homelessness reduction among veterans: 50% cut in 10 years (2010-2020) - Cited as evidence that federal prioritization plus housing and services can substantially reduce homelessness. Share of homeless people in California from California: 90% - Used to show homelessness is largely a homegrown problem rather than caused by in-migration for benefits. People receiving federal rental assistance: 1 in 5 - Used to illustrate that current rental assistance reaches only a minority of those who need it. Seattle housing production: About 10,000 units per year - Described as substantial but still far below what is needed to offset growth and existing shortage. Seattle zoning for single-family use: 70%+ of parcels - Cited as a major constraint on housing capacity in the city. Typical rent threshold associated with homelessness problems: Above $2,000/month - Colburn says jurisdictions above this level start to resemble high-homelessness cities like DC and San Francisco. Median gross rent in lower-cost cities: About $700-$800/month - Examples included Cleveland, Detroit, and St. Louis around the time of the book’s data. Median gross rent in higher-cost cities: Over $2,000/month - Examples included Palo Alto and San Francisco; Seattle was near but not above this level at the time. Dallas rent estimate: About $1,100-$1,200/month - Provided as an approximate comparison to Seattle/San Francisco. Houston rent estimate: High hundreds approaching $1,000/month - Used to contrast affordability in large Sun Belt metros. Age of book data: 2019 - The authors note their analysis uses data ending in 2019, pre-pandemic. Cost-burden comparison example: Detroit has higher cost burdens than San Francisco - Illustrates why relative burden is misleading and absolute rent matters more. Decommodified housing share in Northern Europe: 15-30% - Used as a benchmark for the scale of nonmarket housing abroad. Decommodified housing share in the United States: Less than 1% - Highlights how little housing exists outside the private market in the U.S.

Pivotal Quotes: "Homelessness is a housing problem." — Greg Colburn / book thesis: Core argument of the interview and the book title. "The more the middle class thrives, the better the economy is for everyone, even rich people like me." — Nick Hanauer: Framing statement for the show’s broader middle-out economics perspective. "We have created the conditions in our community that have produced this crisis." — Greg Colburn: Explains that homelessness is largely a local and structural outcome rather than a moral failing or single-cause issue.

Implications: Listeners should view homelessness as a housing-supply and affordability crisis requiring zoning reform, faster building, rental assistance, and nonmarket housing. Short-term sweeps may change visibility, but only sustained investment can reduce homelessness at scale.