Demand for office space in a city falls sharply, yet the existing stock of office buildings stays nearly the same for years. Which feature of real estate markets best explains why supply does not contract quickly?
Correct Answer
D) Buildings are long-lived, so existing supply is slow to shrink
Real estate supply adjusts poorly to a drop in demand because building improvements last a long time, so the stock cannot be quickly reduced. Builders do not usually speed up construction when demand falls, credit conditions do affect supply through new construction, and if offices could readily be converted to other uses the stock would shrink quickly rather than persist.
Why This Is the Correct Answer
Option D is correct because most building improvements have a long life, so the existing supply cannot be reduced when demand decreases. The office stock stays largely in place, and the market adjusts through vacancy and pricing instead.
Why the Other Options Are Wrong
Option A: Falling demand prompts builders to speed up new construction
Option A says falling demand prompts builders to speed up new construction. Weaker demand normally discourages new construction; and even if new building slows, the existing long-lived stock remains, which is the real reason supply does not shrink.
Option B: Credit conditions have little effect on real estate supply
Option B claims credit conditions have little effect on real estate supply. In fact interest rates and credit affect supply through their impact on new construction, and this option does not explain why the existing stock persists.
Option C: Owners can readily convert empty offices to other uses
Option C says owners can readily convert empty offices to other uses. Conversion is usually costly and slow, and if it were easy the office stock would shrink quickly, the opposite of what the stem describes; the stock persists because buildings are long-lived.
Easy to add, hard to subtract
Supply grows slowly because building takes time, and it barely shrinks because buildings last. Both directions lag, but the downside lag is driven by durability.
How to use: Use this when a question asks why vacancies or oversupply persist after demand weakens.
Exam Tip
Separate the two supply frictions: long construction lead time explains slow increases, while long building life explains slow decreases.
Common Mistakes to Avoid
- -Assuming supply falls as fast as demand does
- -Confusing the slow supply response to rising demand with the reason supply fails to shrink
Concept Deep Dive
Analysis
The question asks why real estate supply is 'sticky' on the way down. The key idea is durability: once built, improvements remain in the market for decades, so a fall in demand shows up first as higher vacancy and weaker prices or rents rather than a smaller stock.
Background Knowledge
Real estate markets differ from idealized competitive markets in several ways, including long lead times to build and the long life of improvements. Long lead times delay the supply response when demand rises, and durability prevents supply from shrinking when demand falls, so imbalances can persist.
Real-World Application
After a major employer leaves a downtown, an appraiser valuing an office building finds rising vacancy but almost no change in the number of competing buildings. The analysis focuses on lease-up time and rent levels, since the competing stock will remain in the market.
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