The Four Quadrants Diagram illustrates the system of forces in the real estate sector. The interaction between the development sector, the capital market, and the space market creates a long-term equilibrium.

  • Top-right quadrant: This represents the relationship between total space supply and rents. The greater the total market supply, the lower the rents, and vice versa.
  • Top-left quadrant: This represents the relationship between rents and property prices. Higher rents lead to higher property prices and vice versa.
  • Bottom-left quadrant: This shows the relationship between property prices and new construction levels. Higher prices incentivize more development, and vice versa.
  • Bottom-right quadrant: This reflects the relationship between new construction and total supply. The more new developments occur, the greater the total space supply, accounting for depreciation.

Source: Commercial Real Estate Analysis and Investments by D. M. Geltner, N. G. Miller, J. Clayton, and P. Eichholtz.

This model effectively explains market dynamics and the inevitability of real estate bubbles and crashes.

Example:

Suppose there is an unexpected increase in demand. This would shift the curve in the top-right quadrant to the right, causing an increase in rents (top-right quadrant) and property prices (top-left quadrant) because supply cannot quickly adjust to the sudden demand. Rising prices stimulate the development sector (bottom-left quadrant), leading to new supply (bottom-right quadrant). Over time, equilibrium shifts downward on the new curve, causing rents and prices to decrease.

Thus, in the short term, rents and prices might rise to levels R1 and P1, but in the long-term equilibrium, they stabilize at levels R** and P**, which should exceed the initial levels R* and P* in a rational market.

The model suggests that the system generally expands rightward and downward, indicating that long-term stability in rents and prices is supply-driven.

Observations:

In countries with less land scarcity, real rents tend not to increase. Below is a comparison of general inflation with rent inflation (Residential Rent Index).

Source: Commercial Real Estate Analysis and Investments by D. M. Geltner, N. G. Miller, J. Clayton, and P. Eichholtz.

Why property prices rise faster than inflation? I think, this is primarily explained by the general trend of declining cap rates.

Source: Commercial Real Estate Analysis and Investments by D. M. Geltner, N. G. Miller, J. Clayton, and P. Eichholtz.

Unexpected changes in capitalization rates

Unexpected changes in capitalization rates also impact long-term equilibrium. For instance, changes in cap rates affect the slope of the curve in the top-left quadrant, leading to a rise in property prices and a decrease in rents. Initially, prices increase sharply, but as supply adjusts, equilibrium stabilizes at a new level with lower rents.

Source: Commercial Real Estate Analysis and Investments by D. M. Geltner, N. G. Miller, J. Clayton, and P. Eichholtz.