Air has great utility, yet ordinarily it has no market value. Which prerequisite of value is missing?
Correct Answer
A) Scarcity
Air is freely available in unlimited quantity, so it lacks scarcity; without scarcity a good cannot have value. It clearly has utility, and conformity and physical durability are not prerequisites of value.
Why This Is the Correct Answer
Option A is correct because air is not scarce; it is freely available to all in unlimited quantities, and without scarcity a good cannot have value. Air has great utility, so utility is not what is missing. Scarcity is the factor that keeps air from being an economic good.
Why the Other Options Are Wrong
Option B: Utility
Option B, Utility, is present: air has a great deal of utility. Since air clearly has utility, utility cannot be the missing prerequisite.
Option C: Conformity
Option C, Conformity, is a principle about how a property fits with its surroundings. It is not one of the prerequisites of value, so its absence does not explain why air lacks market value.
Option D: Durability
Option D, Durability, describes how long something lasts physically. It is not a prerequisite of value, and it does not explain why air ordinarily has no market value.
Useful Plus Scarce
Air is useful but free because there is plenty for everyone. Value appears only when something useful is also limited.
How to use: Use the air example to remember that utility alone does not create value.
Exam Tip
When a question says something is useful but has no value, look for the missing scarcity. Principles like conformity are not prerequisites of value.
Common Mistakes to Avoid
- -Choosing utility as the missing element even though air is clearly useful
- -Treating principles such as conformity as prerequisites of value
- -Thinking utility alone is enough to create market value
Concept Deep Dive
Analysis
This question tests the prerequisites of value using air as an example. Air has great utility but is freely available in unlimited quantities, so it is not scarce. Without scarcity, a good cannot have value, which identifies the missing element.
Background Knowledge
For something to have value, it must have utility and be scarce, and appraisal texts also cite desire and effective purchasing power. Utility alone is not enough; a useful good that is unlimited and free does not command a price. Real estate has value because land and improvements are both useful and limited in supply.
Real-World Application
An appraiser explains to a homeowner why waterfront lots command premiums. The water view is useful and desirable, and there are only a limited number of lots with frontage. That combination of utility and scarcity supports the higher prices buyers pay.
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