Supply, Demand & Absorption
~11 min read · Read market cycles and absorption to describe current conditions honestly.
Market analysis reads the balance of supply and demand before any comp is chosen: months of inventory, absorption rates, and the cycle phase decide whether prices are rising under your comps or sliding out from under them.
Supply, demand, and price
Real estate demand shifts with employment, incomes, population, financing costs, and consumer confidence; supply with construction, conversion, and demolition — and supply is famously slow to respond (construction lags), which is why markets overshoot. Price rises when demand outruns supply and falls in reverse — but transaction volume and days-on-market move FIRST; price is the lagging signal.
- Demand: jobs, rates, demographics; supply: building lags
- Volume and DOM lead; price follows
- Overshoot is structural — construction can't stop on a dime
The analyst's gauges
Months of inventory/supply = current listings ÷ monthly sales pace: ~6 months is the balanced-market convention — below favors sellers (appreciation pressure), above favors buyers. Absorption rate = units the market takes per period; new-project feasibility and exposure-time opinions ride on it. Supporting gauges: list-to-sale-price ratios, DOM trends, permit and construction pipelines, vacancy rates for income property.
- Months of supply = inventory ÷ monthly sales; ~6 = balance
- Absorption: units absorbed per period
- Watch DOM, list/sale ratios, permits, vacancy
Cycles
Markets cycle through expansion → oversupply/hypersupply → recession → recovery; neighborhoods echo with growth, stability, decline, revitalization. The appraiser's duties: identify the phase, support any market-conditions (time) adjustments with data, and reflect current — not remembered — conditions in exposure time and value.
Worked example
A suburb shows 210 active listings with 70 sales/month in January; by July, 480 actives against 60 sales/month, DOM up from 12 to 41 days, and list-to-sale ratios off from 101% to 96%. An appraiser is using a February comp for an August effective date. What does the market analysis dictate?
January: 210 ÷ 70 = 3.0 months — a seller's market. July: 480 ÷ 60 = 8.0 months — past balance into buyer's territory, corroborated by tripled DOM and sub-list pricing. The market moved from appreciation to softening inside six months: the February sale closed under conditions that no longer exist, so a downward market-conditions adjustment (supported by the paired data and ratio trends) is required before that comp speaks to August value — and exposure-time commentary should reflect the 41-day norm. The gauges did the work: months of supply diagnosed the phase; the adjustment translates it into the grid.
Common exam pitfalls
Reading price as the leading indicator.
Inventory, DOM, and volume turn first — price confirms later. Diagnose from the leading gauges.
Using stale comps without time adjustments in a moving market.
A comp carries its sale date's market — support and apply market-conditions adjustments to the effective date.
Treating six-months-supply as law.
It's a convention — segment norms differ; establish the local balance point from data.
Count the months of supply: three is a seller's sprint, six is balance, nine is a buyer's stroll.
Recap
- Demand moves fast; supply lags — overshoot follows
- Months of supply = inventory ÷ monthly sales; ~6 balanced
- Absorption, DOM, list/sale ratios, permits: the gauge cluster
- Cycle: expansion, hypersupply, recession, recovery
- Phase identification supports time adjustments and exposure time
- Value reflects current conditions, not remembered ones
Prove it: 10 questions on this topic
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