Housing
Rate, permit, start, sale, price — the causal chain that connects monetary policy to the housing market.
30-Year Fixed Mortgage Rate
What it is: The average rate on a 30-year fixed-rate mortgage, reported weekly by Freddie Mac.
Why it matters: This is the actual cost of capital for the median US home buyer — more directly than the Fed funds rate, which only enters the housing market through this transmission. Movements in the mortgage rate are what change affordability, not Fed announcements.
How to read it: A 1 percentage point move in the mortgage rate changes monthly payment on a typical loan by roughly 10–12%. Sustained moves of more than 2 points reshape the housing market — they make existing homeowners reluctant to sell (the lock-in effect), which in turn collapses inventory and supports prices even when sales volumes decline.
30-Year Fixed Mortgage Rate, Long View
What it is: The same 30-year mortgage rate shown above, displayed from 1971 to present.
Why it matters: The long view shows that the post-1980s decline in mortgage rates was the single most important housing tailwind of the past 40 years. The full-cycle range — 18% in 1981 to under 3% in 2020 — defines the boundaries of what "normal" can mean.
How to read it: Use this chart to calibrate the recent move. A rise from 3% to 7% looks dramatic on the recent chart; on the long view it's a return to roughly the late-1990s range. The question is not whether rates are "high" by recent standards but where they sit in the longer cycle, and what the unwinding of zero-bound monetary policy implies for the next decade.
Mortgage Spread Over 10-Year Treasury
What it is: The 30-year mortgage rate minus the 10-year Treasury yield — the credit and duration premium that lenders charge above the risk-free benchmark.
Why it matters: Mortgage rates have two components: the risk-free Treasury rate (set largely by Fed policy and growth expectations) and the spread (set by the market's appetite for mortgage credit risk). When the Fed cuts rates, only the first component moves automatically; the spread can stay wide, blunting the transmission.
How to read it: The spread averages around 1.7 percentage points across history. Excursions above 2.5 points indicate stressed mortgage credit conditions — visible in 2008 and again post-2022. A wide spread means even falling Treasury yields will not fully translate to lower mortgage rates. Watch this chart to gauge how much of any future Fed easing will actually reach the housing market.
Building Permits, New Privately Owned Housing Units
What it is: New privately-owned housing units authorized by building permits, reported monthly at a seasonally-adjusted annualized rate.
Why it matters: Permits are the most leading housing indicator. A permit means a builder has decided to build — a forward-looking commitment of capital made when financing is available, demand looks adequate, and rates are tolerable. Permits today become starts in 1–2 months and completed homes in 6–12.
How to read it: Sustained declines in permits are the earliest reliable signal of a housing slowdown. Permits have led every major housing turn since reliable data began. Sharp declines below 1 million units annualized historically coincide with broader recessions. The current reading should be evaluated against both the recent cycle and the structural shortfall of housing supply that built up after 2008.
Housing Starts, New Privately Owned Housing Units
What it is: New privately-owned housing units on which construction has begun, reported monthly at a seasonally-adjusted annualized rate.
Why it matters: Starts are the construction step that follows permits. The gap between permits and starts measures developer hesitation — projects approved but not yet broken ground. Starts also feed directly into GDP through residential investment.
How to read it: Compare against permits in the chart above. When starts converge on permits, builders are confident enough to act on their plans; when they fall short, hesitation is building. Starts also matter as a flow measure: the cumulative gap between starts and household formation since 2008 is the structural undersupply that supports prices even when interest rates rise.
Months of Supply, New Single-Family Homes
What it is: The number of months it would take to sell the current inventory of new single-family homes for sale at the current sales pace, computed from Census Bureau data.
Why it matters: This is the supply/demand balance indicator for the housing market. Permits and starts measure supply creation; sales measure demand activity. Months of supply is the ratio — it tells you whether demand is keeping up with what's being built.
How to read it: A reading near 6 months is the historical reference for a balanced market. Sustained readings above 7 indicate an oversupplied market with downward pressure on prices; readings below 4 indicate excess demand and upward price pressure. Changes in this series tend to lead Case-Shiller price changes by 6–12 months — supply imbalances translate to prices with a lag.
Case-Shiller National Home Price Index, YoY %
What it is: Year-over-year percent change in the S&P CoreLogic Case-Shiller US National Home Price Index, the most widely cited measure of US home price changes.
Why it matters: Prices are the lagging output of the housing cycle. By the time Case-Shiller turns, the rate moves and demand changes that drove the turn happened months earlier. But prices are also what matters for household wealth, mortgage equity, and the political economy of housing.
How to read it: YoY price growth above 5% is historically associated with periods of either easy credit or supply constraints. Negative readings are rare — they have only persisted during the 2008–2012 housing bust in the modern record. The post-2020 surge to 20% YoY was the largest in the index's history; the deceleration since is the unwinding of that move.
Case-Shiller National Home Price Index, Long View with Regime Trends
What it is: The Case-Shiller National Home Price Index from 1987 to present, plotted on a log scale with three regime-specific log-linear trend lines fit through the pre-bubble baseline (1987–1994), the bubble run-up (1995–2006), and the post-recovery period (2013–2019). Each trend line's annualized growth rate appears in the legend.
Why it matters: Three different regimes produced three very different rates of housing price appreciation. The pre-bubble baseline shows what trend looked like in the era before housing became a financialized asset class — close to the long-run real housing trend Robert Shiller documented for 1890–2000. The 2000s bubble run-up was several times that pace. The post-recovery trend is between the two but well above the pre-bubble baseline. The chart asks the central housing question: which trend is the right reference for evaluating current prices?
How to read it: The grey baseline projected across the full chart shows where prices would have been if the pre-bubble trend had continued. The two orange trend lines (bubble and post-recovery) show the modern housing cycle's two upswings. The bubble trend's dashed projection through 2007–2012 illustrates how reality eventually reasserted itself when the trend was unsustainable. The post-recovery trend's dashed projection extends to today; current prices sit above, on, or below this projection depending on the latest reading. Whether current prices are heading toward another bust, settling at a new plateau, or reverting to historical trends is the central housing debate — and the chart is structured so the reader can see the case for each reading.
Real Case-Shiller Home Price Index (CPI-Deflated, Jan 2000 = 100)
What it is: The Case-Shiller National Home Price Index divided by the CPI to remove general inflation, then re-indexed to 100 at January 2000.
Why it matters: Nominal home prices have multiplied roughly 5x since 1987, but most of that increase is general inflation in the price level — wages, food, and rent have also risen. The real-prices view answers a different question: are houses more expensive than they used to be, controlling for what everything else costs? Robert Shiller's foundational housing work argued that real US home prices were roughly flat from 1890 to 2000 — meaning the post-2000 era is genuinely unusual.
How to read it: A reading of 100 means real housing prices are at their January 2000 level — meaningfully before the 2000s bubble began. Readings persistently above 150 suggest housing has become structurally more expensive in real terms, which can reflect either genuine supply shortages, financialization of housing as an asset, or both. The 2006 peak and the post-2020 acceleration are the two periods in the modern record where real prices ran far above any reasonable trend; whether the recent level is sustainable depends on whether the structural factors driving it are durable.