In housing-stock research, what does downward income filtering describe?
Correct Answer
C) Units shifting toward occupancy by lower-income households over time
Downward income filtering describes housing units becoming occupied by lower-income households over time in the stated process. Aging does not guarantee this outcome: renovation, location demand, costs or loss of units can alter direction and affordability. It is a descriptive housing-stock concept, not a demographic appraisal adjustment.
Why This Is the Correct Answer
Option C is correct because downward income filtering describes units shifting toward occupancy by lower-income households over time. It is a descriptive concept about how housing stock moves between income groups. Aging does not ensure this outcome, since renovation, location demand, costs or loss of units can change its direction.
Why the Other Options Are Wrong
Option A: Any renovation of older units costing more than new construction
Option A is wrong because renovation of older units costing more than new construction is a cost comparison, not a description of which households occupy the units over time.
Option B: New construction raising rents for the older units in the same area
Option B is wrong because new construction raising rents for older units in the same area describes a price effect, not units moving toward lower-income occupancy. It runs opposite to the filtering idea.
Option D: Rents rising faster than household incomes over a decade
Option D is wrong because rents rising faster than household incomes over a decade describes an affordability trend, not the shift of specific units to lower-income occupants.
Filter down the income ladder
Picture a unit sliding down an income ladder over time as newer homes attract higher-income buyers.
How to use: Use this to tell downward filtering apart from rent or cost trends in answer choices.
Exam Tip
Look for the answer that describes who occupies the units over time, not what happens to rents or costs.
Common Mistakes to Avoid
- -Confusing filtering with rising rents or affordability trends
- -Assuming every aging unit filters downward
- -Using filtering or demographics as a basis for a value adjustment
Concept Deep Dive
Analysis
This question tests the meaning of downward income filtering in housing research. The term describes housing units becoming occupied by lower-income households over time. Candidates should not confuse it with rent trends, renovation costs or new-construction effects.
Background Knowledge
Filtering theory describes how housing units move between income groups as they age and as newer stock is added. Downward filtering moves units to lower-income households, while upward filtering, as in gentrification, moves them to higher-income households. It is a descriptive housing-stock concept and is not a basis for demographic adjustments in appraisals.
Real-World Application
A housing study of an older suburb finds that homes first bought by higher-income families decades ago are now largely occupied by moderate-income households. An appraiser reading the study treats this as background on housing stock, not as a reason to adjust value based on who lives there.
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