Absorption rate expressed in units per month is calculated by:
Correct Answer
D) Dividing units sold by the number of months observed
Why this is correct: The absorption rate measures how quickly the market sells available inventory. It is calculated by dividing the total number of units sold over a period by the number of months in that period (e.g., 30 units sold over 6 months = 5 units/month). Why the other choices are wrong: 'Subtracting new listings from closed sales' calculates net change in inventory, not the rate of absorption. 'Multiplying listings by the average sale price' calculates total potential sales volume, not a rate. 'Dividing active listings by the total housing stock' calculates market share, not absorption. Exam tip: Absorption Rate (units/month) ÷ Active Listings = Months of Supply. Know this relationship.
Why This Is the Correct Answer
Option D states the calculation correctly: units sold divided by the number of months observed. That produces a rate, meaning a quantity per unit of time, which is what absorption measures. The definition is built from actual completed transactions rather than from listings or inventory counts, so it reflects demand realized rather than supply offered. From that rate the appraiser can derive months of supply and a projected sell-out period.
Why the Other Options Are Wrong
Option A: Subtracting new listings from closed sales
Subtracting new listings from closed sales measures the net change in inventory over a period, which is a useful indicator of whether supply is building or shrinking but is not a rate of absorption. The result can even be negative, which no absorption rate can be. The two statistics answer different questions about the same market.
Option B: Multiplying listings by the average sale price
Multiplying listings by average price yields an estimate of total dollar volume in inventory, which describes market size rather than speed. Absorption is measured in units per unit of time and is indifferent to price level. Introducing dollars into the calculation guarantees the wrong dimension.
Option C: Dividing active listings by the total housing stock
Dividing active listings by total housing stock produces the share of the stock currently offered for sale, sometimes used as a listings ratio or turnover indicator. It says nothing about how fast those listings are selling. Confusing a share with a rate is the specific error this option tests.
Rate Is Always Per Time
Absorption is a rate, and every rate has time in its denominator. Units sold on top, months on the bottom. If a proposed formula has no months in it, it is not an absorption rate no matter how sensible it sounds.
How to use: Check the units of each candidate formula before reading further; only one produces units per month. Then remember the companion relationship, inventory divided by the monthly rate gives months of supply. Segment the calculation by price range before drawing conclusions about the subject's bracket.
Exam Tip
Compute absorption for the subject's specific price range and property type, since a market-wide figure can be badly misleading for a property at either end of the price spectrum.
Common Mistakes to Avoid
- -Using a market-wide absorption rate for a property in an atypical price segment
- -Computing absorption from listings rather than from closed sales
- -Measuring over a window so short that seasonality distorts the rate
Concept Deep Dive
Analysis
This question tests the mechanics of the absorption rate, a basic measure of how quickly a market takes up available inventory. It is computed by dividing units sold by the number of months over which those sales occurred, producing units per month. Thirty sales over six months gives five per month. The companion figure, months of supply, is obtained by dividing current active inventory by that monthly rate, so 40 active listings against five per month indicates eight months of supply. Together the two numbers describe market balance: roughly six months of supply is conventionally treated as equilibrium, with less indicating a seller's market and more a buyer's market. Appraisers use these figures in the market conditions section of a report, in supporting an exposure time or marketing time opinion, and in subdivision development analysis where the sell-out period drives carrying costs and discounting. Two cautions apply. The rate should be computed over a period long enough to smooth seasonality but short enough to reflect current conditions, and it should be segmented by price range and property type, since a market can absorb entry-level homes quickly while high-end inventory sits.
Background Knowledge
You need to know how absorption rate and months of supply are computed and how they relate, and the conventional interpretation of roughly six months of supply as market balance. You should also know that these measures support the market conditions analysis, the exposure and marketing time opinions, and subdivision development analysis, and that they should be segmented by price range, property type, and submarket to be meaningful.
Real-World Application
Analyzing market conditions for a $750,000 home, an appraiser finds the overall market absorbing 42 units per month with four months of supply, but the segment above $700,000 absorbing only 3 per month against 27 listings, a nine-month supply. The report uses the segment figures to support the exposure time opinion.
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