What limitation can a simple aggregate linear age-life model have?
Correct Answer
D) One fraction may obscure differing component lives and separately identifiable causes.
A simple aggregate linear age-life model represents the measured loss through one effective-age/life fraction. It can obscure differing component lives or specific functional/external effects. Such models can be useful when supported, but they are not restricted to one property type or automatically inclusive of every cause regardless of how calibrated.
Why This Is the Correct Answer
Option D is correct because a simple aggregate model uses one effective-age/life fraction for the whole improvement. Building components such as roofs, appliances and structural systems have different useful lives, and functional or external losses may have separate causes. One fraction can obscure those differences, which is why short-lived and long-lived components are often analyzed separately.
Why the Other Options Are Wrong
Option A: It is legally prohibited for residential property.
Option A claims the model is legally prohibited for residential property. The age-life method is a recognized technique used for many property types, including homes; its limits are analytical, not a legal ban.
Option B: It can be applied only to commercial income-producing buildings.
Option B says it can be applied only to commercial income-producing buildings. The age-life approach is not restricted to one property type and is commonly used for residential and other properties when supported.
Option C: It gives precise component-specific loss for each building item without any further evidence.
Option C claims it gives precise component-specific loss for each building item without any further evidence. A single overall fraction does the opposite: it blends items together and does not measure each component's loss separately.
One fraction blurs the parts
A single age-life fraction treats the building as one item, so it can blur components with different lives and losses with different causes.
How to use: Use this to spot the limitation when a question asks about a simple overall age-life model.
Exam Tip
When an option claims a method is legally banned or limited to one property type, check whether that is a real rule or a distractor. Limitations of depreciation methods are usually about what they can measure.
Common Mistakes to Avoid
- -Assuming one age-life ratio captures every type of depreciation
- -Believing the age-life method is limited to certain property types
- -Double-counting short-lived components by depreciating them both separately and in the overall ratio
Concept Deep Dive
Analysis
This question tests understanding of what a single overall age-life ratio can and cannot show. Applying one effective age to life fraction to the whole building blends together components with different lives and may hide separate causes of loss. The correct answer identifies that limitation rather than a legal or property-type restriction.
Background Knowledge
The age-life method can be applied to the improvement as a whole or to individual components. Physical deterioration is often calculated separately for short-lived and long-lived components to avoid double depreciation of short-lived items. Functional and external obsolescence may also need separate analysis rather than being assumed to sit inside one age-life ratio.
Real-World Application
An appraiser applies one overall age-life ratio to a 25-year-old house whose roof and furnace were just replaced while the kitchen is original. Because a single ratio may misstate loss on those differing components, the appraiser considers a breakdown analysis of short-lived and long-lived items.
More Cost Approach Questions
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Improvement cost new is $595,000. Separately supported improvement depreciation deductions of $48,000, $27,000 are expressly nonoverlapping and not already excluded from cost new. Add supported site value of $155,000, already reflecting any site losses. What total indicated value results?
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Which scenario most strongly supports giving the cost approach substantial weight?
A cost total $650,000 explicitly includes $40,000 of non-realty FF&E outside the appraised real-property interest. Exclude it. Supported realty-only total depreciation is $55,000. Add site $200,000, with no overlap. What real-property cost indication results?
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Previous Question
An appraiser prices five installed components, with no overlap among them, at $48,000, $125,000, $58,000, $92,000 and $105,000. Indirect costs of $72,000 are additional. The effective age is 16 years and the total economic life is 64 years. Using straight-line age-life depreciation on the full cost, with no salvage value, other losses or site value, what is the depreciated cost of the improvements?
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Which fact supports treating an external loss as temporary?