Key takeaways
- Median sale price measures the mix of what sold, not the change in value of homes.
- Repeat-sales indices isolate price change but lag by months.
- Months of supply is the clearest single indicator of market balance.
- Most series are seasonally adjusted and revised — read the methodology before the headline.
Median price is a mix statistic
Median sale price tells you the midpoint of what transacted. If luxury sales surge while entry-level activity falls, median price rises even if no individual home gained value. This mix effect is responsible for a large share of confusing housing headlines.
Repeat-sales indices such as Case-Shiller and the FHFA House Price Index solve this by tracking the same properties over successive sales. They measure price change more accurately and publish with a two-month lag plus smoothing, so they describe the recent past rather than the present.
Inventory, supply, and the balance point
Months of supply — active inventory divided by the monthly sales pace — is the most useful single measure of market balance. Roughly six months is conventionally considered balanced; below that favors sellers and above favors buyers. It has held below balanced levels in much of the country for years due to structural undersupply.
Watch new listings separately from total inventory. Total inventory can rise simply because homes are selling more slowly, which is a demand signal rather than a supply signal. New listings measure genuine seller behavior.
Rates, affordability, and the lock-in effect
Mortgage rates drive affordability more forcefully than prices do at the margin. A two-point rate move changes the payment on a given price far more than a typical annual price change does. Affordability indices combine price, rate, and income into one measure and are more informative than any component alone.
The lock-in effect matters structurally: owners holding mortgages well below market rates face a large payment increase to move, which suppresses both listings and sales. It constrains inventory even when demand is weak, and it unwinds only slowly as rates fall or life events force moves.
Sources worth trusting
The Census Bureau and HUD publish new residential construction and sales. The National Association of Realtors publishes existing home sales. FHFA and S&P CoreLogic Case-Shiller publish repeat-sales indices. Freddie Mac publishes the Primary Mortgage Market Survey. The Federal Reserve's FRED database aggregates most of it.
Check the geography, the seasonal adjustment, and the revision history before drawing conclusions. National figures conceal enormous regional variation — housing is a collection of local markets that occasionally move together.
Frequently asked questions
Which indicator predicts a downturn?
No single one. Watch months of supply, days on market, the share of listings with price cuts, and new listing volume together. Divergence between them usually appears before turning points.
Why do different sources report different prices?
Different samples, geographies, methodologies, and timing. Compare each source against itself over time rather than across sources.
Are national housing forecasts useful?
Directionally at best. Local supply, employment, and construction pipelines determine outcomes far more than national aggregates.
Sources & further reading
- U.S. Census Bureau and HUD, New Residential Construction
- S&P CoreLogic Case-Shiller Home Price Index methodology
- Federal Housing Finance Agency House Price Index
- Freddie Mac Primary Mortgage Market Survey
Figures and rules change. Verify current requirements with the issuing agency or a licensed professional before acting.