Housing affordability has deteriorated in major cities across the developed world to a degree that is reshaping where people live, how they work, and what they can afford. In 2026, the median home price in cities like London, Sydney, Toronto, and San Francisco exceeds ten times the median annual income — a ratio that historically signals a severe affordability crisis.
What Is Driving the Crisis
Supply Constraints
The most fundamental driver of housing unaffordability is a persistent gap between housing supply and demand. In most major cities, the number of new homes built each year falls well short of the number needed to accommodate population growth and household formation. This gap has been accumulating for decades.
Zoning laws in most American and Australian cities restrict the vast majority of residential land to single-family homes, preventing denser housing types — apartments, townhouses, duplexes — that can house more people on the same land. Lengthy permitting processes add years and cost to new construction. Neighborhood opposition to new development blocks projects that would add supply. Construction costs have risen significantly due to labor shortages and materials inflation.
Demand Factors
Remote work allowed higher-income workers to move from expensive cities to previously affordable markets, bidding up prices in smaller cities and suburbs. Low interest rates through 2021 increased purchasing power and drove prices higher. Institutional investment in single-family homes has added demand in specific markets.
Who Is Most Affected
Lower-income renters face the most acute pressure — rent increases have outpaced wage growth in most major markets, and the supply of affordable rental housing has declined. Young adults are the most affected age group: homeownership rates for people under 35 have fallen to historic lows in most developed countries. Workers in essential services — teachers, nurses, firefighters — are increasingly unable to afford housing in the cities where they work.
Policy Approaches Showing Results
Zoning Reform
New Zealand's 2021 national upzoning law, which allowed medium-density housing across most urban land, has produced measurable increases in housing supply and moderated price growth relative to comparable markets. Minneapolis, which eliminated single-family zoning in 2019, has seen rents grow more slowly than peer cities. Oregon, California, and several other US states have passed similar reforms.
Social and Public Housing
Vienna, Austria is frequently cited as a model for affordable housing — roughly 60% of residents live in subsidized housing, keeping rents well below market rates. Singapore's Housing Development Board has housed over 80% of the population in public housing since the 1960s. These models require sustained public investment and political will that most cities have not demonstrated, but they show that large-scale affordable housing is achievable.
What Is Not Working
Rent control is the most politically popular housing intervention and among the least effective at addressing the underlying supply problem. While it protects existing tenants in controlled units, research consistently finds that rent control reduces housing supply over time as landlords convert units to other uses or allow them to deteriorate. First-time buyer subsidies and mortgage assistance programs increase demand without increasing supply, typically resulting in higher prices that offset the subsidy benefit.
The Outlook
The housing crisis will not resolve quickly. Supply responses to policy changes take years to materialize — a zoning reform passed today produces new housing in three to five years at the earliest. The most realistic near-term scenario is continued affordability pressure in major cities, with gradual improvement in markets that have enacted meaningful supply-side reforms.