National Economic Index
Glossary
Plain-English definitions of the terms used across the site.
Last updated October 20, 2026
- Basis point (bp)
- One hundredth of a percentage point. A yield moving from 4.00% to 4.25% is a 25bp rise.
- Building permits
- Authorisations to start new homes. Permits fall before construction slows, which makes them an early warning of housing-led downturns.
- Case-Shiller index
- The S&P CoreLogic Case-Shiller index of US home prices, based on repeat sales of the same homes.
- Composite score
- This site’s 0–100 health reading for an economy, averaged from its recession signals. Higher is healthier. See the methodology for the formula.
- Consumer Price Index (CPI)
- The price of a fixed basket of goods and services bought by households. Its year-over-year change is the headline inflation rate.
- Core CPI
- CPI excluding food and energy, whose prices swing sharply. Used to read the underlying inflation trend.
- Credit spread
- The extra yield investors demand to hold corporate bonds instead of government bonds. Wider spreads mean more perceived risk.
- Economic weather
- A one-line daily summary of an economy’s overall conditions, written from the current data.
- Federal funds rate
- The overnight interest rate US banks charge each other, steered by the Federal Reserve. It is the US policy rate.
- FOMC
- Federal Open Market Committee: the Federal Reserve body that sets US interest rates, at eight scheduled meetings a year.
- GDP
- Gross domestic product: the total value of goods and services an economy produces. Real GDP is adjusted for inflation.
- GDP growth (QoQ annualised)
- The US convention for quarterly growth: the change from the previous quarter, scaled up to an annual rate.
- Global median
- The middle value across all tracked economies. Half of economies are above it and half below, so one large economy can’t dominate it.
- High-yield (junk) spread
- The credit spread on bonds rated below investment grade. It widens quickly when investors fear defaults.
- Initial jobless claims
- New applications for US unemployment benefits, published every Thursday. A rising trend is an early sign of layoffs.
- Inversion
- When short-term interest rates are higher than long-term rates. Historically, an inverted yield curve has preceded most US recessions.
- Leaders & laggards
- The best- and worst-performing markets or sectors on the day.
- MoM / QoQ / YoY
- Month-over-month, quarter-over-quarter and year-over-year: the period a change is measured over.
- Nonfarm payrolls
- The monthly count of US jobs added or lost outside agriculture, published on the first Friday of most months.
- PCE price index
- Personal Consumption Expenditures prices: the Federal Reserve’s preferred inflation gauge. It covers a broader basket than CPI.
- Percentage point (pp)
- The arithmetic difference between two percentages. Unemployment rising from 4.0% to 4.5% is a 0.5pp rise.
- Policy rate
- The main interest rate a central bank sets to steer borrowing costs and inflation.
- Recession signal
- One of seven indicators with a published threshold that has historically flagged recessions. A signal trips when it crosses its threshold.
- Regime
- The label for the composite score: expansion (75+), caution (40–74) or recession (below 40).
- S&P 500 sectors
- The eleven industry groups of the S&P 500, such as technology, financials and energy. Here they are tracked through the SPDR Select Sector ETFs.
- Sahm Rule
- A recession signal devised by economist Claudia Sahm. It trips when the 3-month average unemployment rate rises 0.50pp above its low of the previous 12 months.
- Trade-weighted dollar
- The US dollar’s value against a basket of the currencies of major trading partners.
- Treasury yield
- The interest rate on US government debt of a given maturity, such as 2-year or 10-year.
- Unemployment rate (U-3)
- The share of the labour force without a job and actively looking for one. It is the headline US rate.
- VIX
- An index of expected S&P 500 volatility over the next 30 days, derived from options prices. Often called the market’s “fear gauge”.
- Yield curve
- Treasury yields plotted across maturities. Here it is read through two spreads: 10-year minus 2-year, and 10-year minus 3-month.
For how these feed into the composite score, see the methodology.