There was a time when buying a home with a white-picket fence was a staple of the American Dream. The home was a symbol of stability, independence, and upward mobility. At least in the middle twentieth century, one could buy a modest home with a single income. That started changing in the 1970s when the coastal cities became less affordable and Americans started gravitating more towards such Sunbelt metropolitan areas as Phoenix, Atlanta, Dallas, and Miami.
Unfortunately, affording homes in these Sunbelt metropolitan areas is becoming more elusive with skyrocketing housing costs and housing stock decreased (see above). A new National Bureau of Economic Research (NBER) working paper from leading economists at Harvard University and the University of Pennsylvania provides an answer (Glaeser and Gyourko, 2025). From the abstract of the paper:
If the U.S. housing sock had expanded at the same rate from 2000-2020 as it did from 1980-2000, there would be 15 million more housing units...New housing growth rates have decreased and converged across these and many other metros, and prices have risen most where new supply has fallen the most. A model illustrates that structural estimation of long-term supply elasticity is difficult because variables that make places more attractive are likely to change neighborhood composition, which itself is likely other influence permitting. Our framework also suggests that as barriers to building become more important and heterogeneous across place, the positive connection between building and home prices and the negative connection between building and density will both attenuate.
It is not a lack of land because Sunbelt metropolitan areas have plenty of land. What these economists found is that the major culprits for increasing housing costs in the Sunbelt area are zoning laws and other land-use regulations. This is basic supply and demand. When demand for housing increases, whether because of population growth, job opportunities, or migration, and supply does not grow at the same rate, prices are bound to increase.
To give you some examples of these regulations. Zoning laws restrict what can be built and where, which constricts supply. Height restrictions and density caps further constrain supply by limiting the number of people that can live on a given parcel of land. Lengthy permitting processes and environmental reviews create delays and uncertainty for builders, which also limit the number of houses built. When all these housing regulations are combined, they create an artificial scarcity of housing.
This both plays out in economic theory and in practice. This new NBER study is hardly the first study to come to this conclusion. Back in 2017, I illustrated how deregulating the housing market and removing these regulations would boost housing supply. Here is some other research since 2017 illustrating this point:
- In April 2025, the Bush Center estimated in its counterfactual analysis that such pro-growth housing policies as lax zoning laws, reducing minimum lot sizes, and eliminating parking requirements for apartments implemented throughout the country would have lowered housing prices by $115,000 and monthly rent by $450 per month.
- Another NBER paper shows how municipalities with stricter land-use regulations have particularly small and unproductive construction firms (D'Amico et al., 2024).
- The American Enterprise Institute (AEI) wrote a paper about light-touch density (LTD), which is a zoning strategy that incrementally allows for more diverse housing types within existing single-family zones. AEI researchers calculated that LTD could create an average of 930,000 additional housing units per annum over the next 30 to 40 years (Pinto and Peter, 2023).
- The Institute for Transportation & Development Policy reports on how minimum parking requirements contribute to increased construction costs and limit housing availability.
- A study from the Mercatus Center shows that build-to-rent housing bans further constricts housing supply (Furth, 2022).
- The Bipartisan Policy Center released this explainer in 2022 illustrating how housing regulations impact housing supply.
Expensive housing in the United States is no longer an outlier on the east coast or in California. Housing has become less affordable because zoning laws and land-use regulations that have constricted housing supply, thereby increasing housing prices. The housing crisis in the United States is clearly a supply-side issue caused by government regulations. Whether local jurisdictions realize the damage of these regulations and reverse them remains to be seen. What we do know as long as they remain intact, Americans will continue to pay through the nose for housing.