Housing Elasticity: The Structural Reasons Behind Rising Housing Costs

Introduction

In economics, elasticity theory is a fundamental tool for measuring the responsiveness of supply and demand for a good to changes in economic factors such as price, income, or the cost of substitute and complementary goods. Its study helps us understand how consumers, businesses, and investors react to changes in the economic environment and, therefore, anticipate market behaviour.

The price elasticity of demand is calculated by dividing the percentage change in the quantity demanded by the percentage change in the price of the good over a given period. Demand is considered elastic when the result is greater than 1, inelastic when it is less than 1, and unit elastic when it is exactly equal to 1.

Price elasticity of supply, in turn, measures the relationship between the percentage change in the quantity supplied and the percentage change in price. Supply is perfectly elastic when small changes in price generate large changes in the quantity supplied, and perfectly inelastic when changes in price have little or no effect on the volume of supply available.

In Spain, Housing Demand Is Highly Inelastic

In the real estate market, the elasticity of supply and demand is particularly significant. Broadly speaking, both housing demand and housing supply tend to be inelastic, although the degree of inelasticity varies depending on the time horizon, geographical location, and socioeconomic characteristics of each market.

In Spain, housing demand exhibits a high degree of inelasticity for both cultural and economic reasons. The main explanatory factors include the strong tradition of homeownership, limited geographical labour mobility, a high dependence on mortgage financing, and an increasingly ageing demographic structure.

Various studies estimate the price elasticity of housing demand in Spain at approximately between -0.3 and -0.6. This implies that a 10% increase in house prices would reduce demand by only 3% to 6%. This sensitivity is even lower in particularly strained markets such as Madrid, Barcelona, and Málaga, where additional factors place further pressure on demand, including international investment, tourism-related demand, the appeal to foreign residents, and migration flows.

Housing Supply, by Contrast, Is Even More Inelastic

Housing supply, however, exhibits an even greater degree of inelasticity, particularly in major urban areas and coastal regions. The scarcity of developable land, the complexity and slow pace of urban planning procedures, dependence on administrative permits, delays in the approval of general urban development plans, and environmental requirements significantly constrain the market’s ability to respond to increases in demand.

These constraints are compounded by structural factors such as the construction sector’s historically low productivity, rising construction costs, and the growing shortage of skilled labour, all of which make it difficult to expand supply rapidly even in periods of strong price growth.

As a result, the combination of relatively inelastic demand and highly constrained supply creates conditions for sustained growth in house prices, particularly in dynamic cities, established tourist destinations, and areas with limited land availability.

Against this backdrop, a significant short-term reduction in house prices in Spain would require a simultaneous combination of factors that appears unlikely under current conditions: a substantial tightening of financial conditions through higher interest rates, accompanied by a significant increase in available housing supply.

Conclusion

Only over the medium and long term, through policies aimed at increasing the availability of development-ready land, streamlining urban planning procedures, encouraging residential development, and improving access to financing, could a structural moderation in prices be achieved. Even then, the impact would be uneven and would depend on the degree of supply rigidity in each local market. It would likely remain limited in areas where demand pressures continue to significantly exceed the capacity of housing supply to expand.