Homelessness Follows Rent, Not Addiction (2024)

Two states make the case for looking at homelessness and housing costs together faster than any regression can. West Virginia has among the worst opioid overdose rates in the country and among the lowest homelessness rates. California has far less addiction per capita and roughly a fifth of the nation's homeless population. If substance use drove the outcome, those numbers would sit the other way around.

They do not, and the reason is rent.

What does the research find?

In Homelessness Is a Housing Problem, University of Washington researchers Gregg Colburn and Clayton Page Aldern ran regional homelessness rates against the variables people assume are responsible. Poverty rates. Mental illness prevalence. Drug use. Weather. Local generosity of benefits.

None of them explained the variation between metro areas. Two things did: the cost of rent and the rental vacancy rate.

That finding does not say addiction and mental illness are irrelevant. At the individual level they matter a great deal, and they help determine who loses housing when a market tightens. What they cannot explain is how many people lose it. That number is set by how much slack exists in the housing stock and how far the median rent sits above what local wages can carry.

Why does the same person end up housed in one city and not another?

Because a tight rental market has no forgiveness in it.

Picture a metro with a 9% vacancy rate. Someone loses a job, misses rent, and gets evicted. Units sit empty, so landlords screen less aggressively and price competitively. That person lands somewhere worse, cheaper, farther out. Bad month, not a catastrophe.

Now the same person in a metro with a 2% vacancy rate. Every open unit draws a stack of applicants with better credit, higher income, and no eviction record. Screening tightens because it can. There is nowhere down-market to fall, because the down-market units were bid up by people who used to rent one tier higher.

That is the whole mechanism. Scarcity converts an ordinary financial shock into homelessness, and the conversion rate rises with price.

How tightly do homelessness and housing costs move together?

Researcher Chris Glynn and colleagues estimated the elasticity directly: a $100 increase in median rent in a metro area associates with roughly a 9% rise in estimated homelessness, with steeper effects in markets already near capacity. Zillow's research team found a similar inflection, with homelessness climbing sharply once median rent passes roughly a third of median income in a metro.

Source: Colburn and Aldern, University of Washington, regional analysis of U.S. metro areas.

Hold that table next to the affordability picture. About 45 million U.S. households rent (Census). Roughly half spend more than 30% of income on housing and about 12 million spend more than half (Harvard Joint Center for Housing Studies; HUD). Those 12 million severely burdened households are the population sitting closest to the edge, and the edge moves toward them every time rent rises faster than pay.

Why does the addiction story stick anyway?

Because it matches what people see.

Unsheltered homelessness is visible, and untreated addiction and psychiatric crisis are visible with it. A tent encampment shows you the hardest and most chronic end of the population, which is also the end where behavioral health problems concentrate. Nobody sees the family doubled up in a cousin's living room, the woman sleeping in her car before a 6 a.m. shift, or the household that got a voucher and never found a landlord who would take it.

The visible slice becomes the explanation for the whole. Then policy follows the story instead of the data, and cities spend on managing the symptom while rent keeps setting the volume.

The other reason it sticks: the addiction story lets the cause stay personal. A housing-cost story implicates zoning boards, wage floors, and thirty years of underbuilding. Those are harder to look at, and they are covered in why America does not build more housing and zoning laws and the housing shortage.

What about the people already unhoused?

The research on housing costs describes inflow, meaning how many people fall in. Getting people back out is a separate problem, and the honest version is that it is harder the longer someone stays out.

Chronic homelessness involves disability, illness, and trauma that intensify with every month outside, which is why permanent supportive housing pairs a unit with services rather than requiring treatment first. That pairing has the strongest evidence base for the chronic population.

But treatment capacity does not fix inflow. If a metro rehouses 1,000 people a year while rent increases push 1,500 more into homelessness, the count rises no matter how good the programs are. Cities across the country have been running exactly that arithmetic and wondering why the numbers keep climbing.

Who is one bad month away?

More people than the count suggests. The Federal Reserve's Survey of Household Economics and Decisionmaking has found that roughly a third of adults could not cover a $400 emergency expense with cash or its equivalent. Surveys from Bankrate and LendingClub put the share of Americans living paycheck to paycheck above 60%.

Stack that against a median asking rent that consumes a third or more of median income in most large metros, and the exposure shows up on its own. We ran the numbers separately in how many Americans are one paycheck from homeless, and the pathway from missed payment to court filing is mapped in eviction rates in America. The safety net that is supposed to catch these households reaches about one in four of them. How housing vouchers work covers why.

The cause nobody wants to name

Homelessness in the United States is a price problem wearing a behavioral health costume.

The country underbuilt housing for more than a decade, restricted where new units could go, let the federal wage floor sit at $7.25 since 2009, and funded rental assistance as a discretionary line item rather than a guarantee. Every one of those was a decision. Together they set the vacancy rate and the rent level, and those two numbers set how many people end up outside. Individual struggles determine which specific people. The market determines how many. Until rents and wages move back toward each other, the count goes up regardless of how many treatment beds get built. That is the same gap running through the broken American Dream.