What moves prices
| Borrowing cost | Durable. The monthly cost of a given loan changes what a buyer can offer, and it can change within months. |
|---|---|
| Incomes | Durable but slow. Local earnings set the long-run floor and ceiling that credit conditions swing around. |
| Supply response | Durable but very slow. Building takes years, so a shortage persists long after it is identified. |
| Mix of sales | Noise. If larger homes happen to sell this quarter, the average rises without any home being worth more. |
| Asking prices | Noise. An asking price is a request. Only completed sales record what was actually paid. |
| Seasonality | Noise. Listing and completion volumes follow the calendar, and unadjusted figures inherit that pattern. |
Price commentary is dominated by figures that are technically accurate and practically misleading. It helps to sort the inputs into two piles: things that change what a home is worth, and things that change what the published number says.
The durable drivers
The cost of borrowing
For most buyers the binding constraint is not the price but the monthly payment and the size of loan a lender will approve against their income. When rates fall, the same income supports a larger loan, and bidding capacity rises across the whole market at once. When they rise, capacity falls the same way. This is the fastest-acting driver there is, and it explains why markets can turn without any change in the housing itself.
A worked example makes the size of the effect visible. Take a loan of 200,000 in whatever currency, repaid over 25 years. At a 3 per cent annual rate the repayment is roughly 950 a month; at 6 per cent it is roughly 1,290. Nothing about the house changed. The arithmetic above is illustrative only and is not a quotation of any lender's terms.
Incomes
Over long periods, local prices are anchored to local earnings, because earnings are what service the debt. Incomes move slowly, so they rarely explain a single busy year. They explain why one town sits at a different level from another and why prices eventually stop climbing when the ratio between the two becomes extreme.
The supply response
When prices rise, the textbook answer is that more homes get built. They do, but slowly: land, permission, finance and construction each take time, and the response often arrives after the conditions that prompted it have passed. Where the supply response is structurally weak, high prices persist rather than correcting, and the market's adjustment happens through who can afford to live there instead.
The noise
Mix
A district average is the average of whatever happened to sell. If a run of larger detached homes completes in one quarter, the average rises even if every individual home sold for slightly less than it would have a year earlier. Mix effects are the single most common reason a headline figure disagrees with what people on the ground are seeing.
Asking prices versus achieved prices
An asking price is a marketing position. It reflects a hope, a strategy, and sometimes a deliberate under-pricing to attract competition. Achieved prices, recorded at completion, are the only figures that describe what was actually paid. The two series can move in opposite directions for months.
Volume as the honest signal
When people ask which local number to watch, transaction volume is usually more informative than average price. Volume responds early and is much less sensitive to mix. A market where agreed sales are falling while prices hold is a market in the middle of turning; the price series will follow later, because it is recorded at completion, weeks or months after the price was agreed.
What does not move prices as much as expected
Cosmetic condition changes what a home sells for by less than most sellers hope, because buyers discount visible work heavily and are frightened by anything structural. Meanwhile the things that do move price are mostly fixed: plot size, orientation, the amount of usable floor area, the road it sits on, and whether the layout can be extended without rebuilding.