Comparing this March's sales with last March's, rather than with this February's, mainly controls for which factor?
Correct Answer
C) Seasonality in market activity
Comparing the same calendar month can help control recurring seasonality if the pattern is relevant and stable. It does not remove all mix changes, calendar effects or demand shifts, and it does not directly control foreclosure shares or underwriting changes.
Why This Is the Correct Answer
Option C is correct because comparing the same calendar month in different years can help control recurring seasonality in market activity, provided the seasonal pattern is relevant and stable. It does not remove all other influences, such as mix changes or demand shifts.
Why the Other Options Are Wrong
Option A: The mix of foreclosures in the data
Option A, the mix of foreclosures in the data, is not controlled by matching calendar months. The share of distressed sales can differ between the two Marches, so it requires separate analysis.
Option B: Changes in mortgage underwriting
Option B, changes in mortgage underwriting, can occur at any point during the year between the two periods. A same-month comparison does not hold underwriting standards constant.
Option D: Population growth in the county
Option D, population growth in the county, is a longer-term demand factor. Comparing year over year actually spans a full year of such growth rather than controlling for it.
Same month, same season
Matching the calendar month matches the season, which is what a year-over-year comparison mainly controls.
How to use: Use it on questions asking what a same-month comparison holds constant.
Exam Tip
Pick the answer tied to the calendar itself. Factors like foreclosures, underwriting or population can change between the two periods regardless of month.
Common Mistakes to Avoid
- -Assuming a year-over-year comparison controls every market change
- -Comparing adjacent months during strong seasonal transitions
- -Ignoring changes in property mix between periods
Concept Deep Dive
Analysis
This question tests why analysts compare the same calendar month across years. Many real estate markets show recurring seasonal patterns in activity and prices. Comparing this March with last March holds the season constant, so differences are less likely to reflect seasonal swings.
Background Knowledge
Seasonality refers to predictable changes in sales volume or prices that repeat at similar times each year. Year-over-year comparisons of the same month are a common way to reduce seasonal distortion in market trend analysis. Other factors, such as property mix, financing and demand changes, still need to be considered separately.
Real-World Application
An appraiser notices that spring sales in a suburban market typically outpace winter sales. To judge whether prices are truly rising, the appraiser compares this spring's sales with last spring's rather than with the preceding winter months.
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