By Neng Nana 
Main Facts: The Geographic Illusion of Abundance
To understand the American housing crisis, one must first confront a stark geographic reality: approximately 97 percent of the United States landmass is classified as rural. Within this vast expanse of open fields, rolling hills, and small towns, there is absolutely no shortage of housing. Homes are plentiful, land is cheap, and the supply-and-demand dynamics of real estate operate without friction.
Yet, this geographic abundance masks a severe, localized crisis. The American housing shortage does not exist across 99 percent of the country’s territory; rather, it is concentrated in an incredibly small, highly coveted fraction of land—roughly 1 percent or less. This dynamic represents an extreme iteration of the Pareto principle: a "99/1 rule" where nearly all of the economic, social, and cultural pain associated with housing scarcity is generated within a handful of high-demand metropolitan areas.
U.S. Land Allocation & Housing Demand Dynamics:
┌─────────────────────────────────────────────────────────────────┐
│ │
│ 97% Rural Land (Abundant Housing) │
│ │
└───────────────────────────────────────────────┬─────────────────┘
│ 3% Urban/Metro
└───────┬─────────┘
│
┌───────────────────┴─────────┐
│ 2.5% Stable/Slow-Growth │
├─────────────────────────────┤
│ 0.5% Closed Access Cities │
│ (Severe Housing Shortages) │
└─────────────────────────────┘At the heart of this crisis are the "Closed Access" cities—coastal metropolises such as Boston, New York City, San Francisco, Los Angeles, San Diego, and Honolulu. These regions occupy a mere 0.5 percent of the nation’s land, yet they serve as the primary engines of the modern knowledge economy. Because housing supply in these areas has failed to keep pace with job growth, millions of Americans face soaring rents, forced displacement, delayed family formation, and rising rates of homelessness.
The debate over how to solve this crisis is frequently derailed by a fundamental misunderstanding of this geographic concentration. Skeptics of housing construction often point to cheap homes in Altus, Oklahoma, or vacant lots in struggling Rust Belt neighborhoods as proof that a national housing shortage is a myth. Economists and housing policy experts argue that this perspective is not only a logical fallacy but also an economic dead end. People do not simply need shelter; they need shelter near economic opportunity.
Chronology: How the Crisis Migrated and Deepened
The structural deficits plaguing the American housing market did not emerge overnight. Instead, they are the product of decades of shifting regulatory barriers, macroeconomic shocks, and evolving migration patterns.
Timeline of the U.S. Housing Supply Crisis:
==========================================================================================
Pre-2008 Era 2008 Financial Crash Post-2010 Recovery 2016–Present
------------------------------------------------------------------------------------------
Local zoning limits Credit freeze; builders Underbuilding persists; Shortage spreads
restrict coastal growth; go bankrupt; industry demand shifts to mid- nationwide; upzoning
inland cities boom. capacity collapses. tier metro areas. reforms face hurdles.
==========================================================================================The Pre-2008 Era: Localized Zoning Bottlenecks
Before the mid-2000s, housing supply constraints were largely confined to the coastal Closed Access cities. Municipalities in California and the Northeast increasingly utilized exclusionary zoning, historic preservation laws, and lengthy environmental review processes to restrict the construction of multi-family housing. Meanwhile, the rest of the country—particularly the Sun Belt and the Midwest—experienced sprawling suburban development that kept housing costs relatively aligned with construction costs.
The 2008 Financial Crisis: The Great Structural Shock
The collapse of the subprime mortgage market and the subsequent Great Recession fundamentally altered the mechanics of American homebuilding. As capital dried up, hundreds of residential developers went bankrupt, and millions of construction workers left the industry.
Crucially, the financing structure for single-family residential development became the binding constraint on new supply. Even as the broader economy recovered, banks maintained highly restrictive lending standards for residential construction. The homebuilding industry was effectively hollowed out, leaving the nation with a structural deficit in construction capacity that has persisted for over a decade.
The Post-2010 Recovery: The Shortage Spreads
As the tech-driven economic expansion of the 2010s concentrated high-paying jobs in major urban centers, the demand for housing in metropolitan areas surged. Because the homebuilding industry had not recovered its pre-2008 capacity, and because local zoning laws remained highly restrictive, supply could not match demand.
What was once a crisis exclusive to San Francisco and New York began to spill over into fast-growing secondary markets like Phoenix, Atlanta, Charlotte, and Austin. By the end of the decade, even slow-growing and historically affordable legacy cities like Buffalo, New York, began to exhibit signs of severe housing stress.
Supporting Data: The 99/1 Rule in Numbers
To understand the mechanics of the housing shortage, researchers have increasingly relied on granular, parcel-level data. The findings consistently show that even when cities attempt to reform their zoning laws, new housing construction remains highly concentrated.
Comparison of New Housing Units per Parcel (NYC, 2016–2021):
┌───────────────────────────────────────┬─────────────┐
│ Category │ Units/Parcel│
├───────────────────────────────────────┼─────────────┤
│ Average Upzoned Parcel (All NYC) │ 2.0+ │
│ Average Non-Upzoned Parcel (All NYC) │ 0.1 │
│ Gowanus (High-demand, upzoned) │ 8.5+ │
│ East Harlem / Jerome Ave (Upzoned) │ Minimal │
└───────────────────────────────────────┴─────────────┘The Urban Institute Study on Upzoning
A study conducted by the Urban Institute analyzed targeted zoning reforms in Philadelphia and New York City between 2016 and 2021. In New York, researchers tracked the outcomes of nine major neighborhood-level upzonings.
- The Average Effect: Upzoned parcels saw an average increase of more than 2.0 housing units per parcel over the study period, compared to a meager 0.1 units per parcel on un-reformed lots across the rest of the city.
- The Concentration Effect: Despite the broad geographic scope of the reforms, nearly 50 percent of all new housing units generated by these nine upzonings were constructed in a single neighborhood: Gowanus, Brooklyn.
- The Negligible Zones: In other upzoned neighborhoods, such as Jerome Avenue in the Bronx and East Harlem in Manhattan, the increase in housing units was small or statistically negligible.
This data highlights the micro-level reality of the 99/1 rule. Gowanus represented less than 10 percent of the total upzoned parcels, yet it absorbed half of the development. In high-demand neighborhoods, upzoning unlocks immense latent demand; in lower-demand areas, upzoning alone is often insufficient to spur construction because projects do not "pencil" financially.
The Case of Vincent Rollet’s MIT Research
This hyper-concentration of development is further supported by research from Vincent Rollet at the Massachusetts Institute of Technology (MIT). Rollet’s analysis of hypothetical city-wide upzoning in New York City concluded that even if the entire municipality were upzoned to allow for higher density, the vast majority of actual construction would occur in a select few neighborhoods.
Developers would focus almost exclusively on areas where historical zoning had artificially suppressed density far below market demand, and where prevailing rents would support high land and construction costs. According to Rollet’s models, if New York City were to expand its housing stock by 20 percent to eliminate its shortage, more than 95 percent of the city’s individual parcels would experience no new construction at all.
The Buffalo Deficit
The 99/1 rule is equally visible in slow-growing or shrinking metropolitan areas. Buffalo, New York, is frequently cited by housing skeptics as an affordable city with no need for new supply. However, historical data tells a different story:
Buffalo Metropolitan Area Housing Deficit (Post-2005):
┌────────────────────────────────────────────────────────┐
│ Expected Trend (Based on Historical Capacity): │
│ 400,000 Existing Homes + 20,000 "Missing" New Homes │
├────────────────────────────────────────────────────────┤
│ Actual Construction: │
│ Deficit of 20,000 Homes │
└────────────────────────────────────────────────────────┘Since 2005, the Buffalo metropolitan region has accumulated a deficit of approximately 20,000 homes relative to historical building trends. In a region with roughly 400,000 housing units, this represents a significant supply bottleneck. While vacant lots persist in economically depressed neighborhoods like Emerson and MLK Park, high-demand neighborhoods in Buffalo have seen rents rise rapidly because zoning and lending constraints prevent the construction of new apartments and single-family rentals where people actually want to live.
Official Responses and Policy Debates: The "Supply Truther" Fallacy
The policy debate surrounding the housing crisis is characterized by deep divisions between supply-side advocates (often referred to as YIMBYs, or "Yes In My Backyard") and housing skeptics, some of whom economists disparagingly label "housing supply truthers."
The Altus, Oklahoma Analogy
A common rhetorical tactic among housing skeptics is to point to the existence of cheap, vacant housing in rural or declining areas as evidence that there is no national shortage. Economists compare this argument to the historical crisis of the Dust Bowl in the 1930s.
During the Dust Bowl, agricultural collapse devastated Oklahoma, forcing hundreds of thousands of "Okies" to migrate to California in search of work. To argue today that America has no housing shortage because there are cheap homes in Altus, Oklahoma, is the economic equivalent of telling Dust Bowl refugees that they should have stayed in Oklahoma because land was cheap, ignoring the fact that there were no jobs to sustain them.
The Migration & Housing Policy Fallacy:
┌─────────────────────────────────────────────────────────────────┐
│ Historical Analogy: The Dust Bowl │
├─────────────────────────────────────────────────────────────────┤
│ • Reality: Jobs were in California; ecological ruin in Oklahoma.│
│ • Fallacy: "Why migrate? Oklahoma has plenty of cheap land." │
├─────────────────────────────────────────────────────────────────┤
│ Modern Parallel: The Housing Shortage │
├─────────────────────────────────────────────────────────────────┤
│ • Reality: High-paying jobs are in Closed Access Cities. │
│ • Fallacy: "Why build in NYC? Altus, OK has cheap houses." │
└─────────────────────────────────────────────────────────────────┘The "Penciling" Dispute
Another major policy debate centers on whether upzoning is effective if projects do not "pencil"—a real estate term meaning that a project’s projected revenues exceed its construction, land, and financing costs.
Skeptics of zoning reform argue that because high interest rates, supply chain disruptions, and labor shortages prevent developers from profitably building in many areas, upzoning is a useless policy tool. Housing advocates counter that this argument misinterprets the 99/1 rule. At any given time, under any economic conditions, the vast majority of potential development projects will not pencil.
Zoning reform is not intended to make every project viable; rather, it is designed to ensure that in the 1 percent of locations where projects do pencil, developers are legally allowed to build.
Implications: The Path to 15 Million Homes
The structural deficit in the American housing market carries profound implications for the nation’s economic growth, geographic mobility, and social cohesion. Resolving this crisis requires a clear-eyed acceptance of the 99/1 rule and a coordinated policy response at local, state, and federal levels.
The Scale of the Challenge: 15 Million Units
To normalize the American housing market—bringing rents and home prices back into alignment with historical income ratios—the United States must construct an estimated 15 million new homes.
Consistent with the 99/1 rule, these 15 million homes do not need to be spread evenly across the country’s vast geographic expanse. Instead, they must be concentrated on less than 1 percent of the nation’s land—specifically within high-demand urban neighborhoods, transit corridors, and inner-ring suburbs of major metropolitan areas.
Projected Allocation of the 15-Million-Unit Housing Goal:
┌────────────────────────────────────────────────────────┐
│ ■ High-Demand Urban Infill (Closed Access Cities) │
│ Estimated: 7.5 Million Units (50%) │
├────────────────────────────────────────────────────────┤
│ ■ Fast-Growing Sun Belt & Mid-Tier Metros │
│ Estimated: 4.5 Million Units (30%) │
├────────────────────────────────────────────────────────┤
│ ■ Slow-Growing Legacy Cities (e.g., Buffalo, Cleveland)│
│ Estimated: 3.0 Million Units (20%) │
└────────────────────────────────────────────────────────┘The Long-Term Necessity of Upzoning
While upzoning alone may not trigger an immediate wave of construction in an environment of high interest rates and capacity constraints, it remains a critical long-term necessity.
In the short term, the homebuilding industry’s lack of capacity and restrictive lending environment act as the primary governors on housing supply. However, as these macroeconomic constraints ease, municipal zoning laws will once again become the binding constraint on growth. Without broad, systemic upzoning, any economic recovery will quickly run into the wall of local opposition, driving up prices and forcing outward migration.
Overcoming the Localized Fallacy
For policymakers, the ultimate lesson of the 99/1 rule is that housing policy must not be dictated by the conditions of a city’s least successful neighborhoods. Just as the existence of cheap homes in Oklahoma does not solve the housing crisis in California, the existence of vacant lots in East Harlem or Buffalo’s East Side does not negate the urgent need for new apartment buildings in Gowanus or downtown Buffalo.
Allowing developers to build where demand is highest is the only viable path to stabilizing housing costs. Broad-based zoning reforms, expanded access to construction financing, and a renewed commitment to expanding housing options are not just local issues—they are national economic imperatives. Until policymakers accept that the housing crisis is a battle fought on 1 percent of the nation’s land, America’s cities will continue to shut their doors to those who need opportunity most.
Azzam Bilal Chamdy 
Lina Irawan 
Nana Wu 