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Cost ApproachEASY13.6% of exam

Market evidence isolates a value loss because an undamaged one-car garage provides insufficient utility relative to competing properties. What is the cause?

Correct Answer

B) Functional inadequacy.

The stipulated market discount for insufficient garage utility is functional inadequacy, not superadequacy. The garage’s existence does not establish adequate utility, and no structural damage is stated. Measure the supported effect without treating every one-car garage as obsolete.

Answer Options
A
Physical deterioration.
B
Functional inadequacy.
C
External obsolescence.
D
Functional superadequacy.

Why This Is the Correct Answer

Option B is correct because the loss comes from the garage providing too little utility relative to competing properties, which is a functional deficiency, or inadequacy. Functional obsolescence is a loss in utility and value due to reduced desirability of the property, and inadequacy is one of its recognized forms.

Why the Other Options Are Wrong

Option A: Physical deterioration.

Option A, physical deterioration, is wrong because the garage is described as undamaged. Physical deterioration comes from wear, damage or deferred maintenance, none of which is stated.

Option C: External obsolescence.

Option C, external obsolescence, is wrong because the cause is the garage itself, a feature of the property, not an off-site influence such as nearby nuisances or market conditions.

Option D: Functional superadequacy.

Option D, functional superadequacy, is wrong because superadequacy means a feature exceeds what the market will pay for. Here the garage provides too little utility, which is the opposite condition, inadequacy.

Too little, too much, outside

Too little utility is inadequacy, too much is superadequacy, both functional. A cause outside the property line is external.

How to use: Use this sorting step whenever a question asks you to name the cause of a value loss.

Exam Tip

Look for words describing condition (damaged, worn) versus utility (insufficient, excessive) versus location (off-site). Each points to a different depreciation category.

Common Mistakes to Avoid

  • -Calling any garage-related loss physical deterioration even when the garage is undamaged
  • -Confusing inadequacy with superadequacy
  • -Assuming a one-car garage causes a loss without market evidence

Concept Deep Dive

Analysis

This question tests classification of depreciation by cause. The garage is undamaged, so the loss is not physical, and the problem is inside the property, so it is not external. Insufficient utility compared with competing properties is a deficiency, which is functional inadequacy.

Background Knowledge

Depreciation is grouped into physical deterioration, functional obsolescence and external obsolescence. Functional obsolescence includes inadequacies, superadequacies and poor functional plans, and it can occur even in relatively new structures. A feature's existence does not by itself prove adequate utility; market evidence shows whether buyers discount it.

Real-World Application

In a neighborhood where most competing homes have two-car garages, an appraiser's paired sales show homes with sound one-car garages sell for less. The appraiser classifies the supported discount as functional inadequacy rather than physical wear.

functional obsolescencefunctional inadequacysuperadequacygarage utilitydepreciation
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