Recession Glossary
Plain-English definitions of 45 key terms from macroeconomics and business cycle analysis. Each definition is written for clarity without sacrificing precision. All data points verified April 2026.
Automatic Stabilisers
Tax-and-spend mechanisms that automatically offset economic downturns without new legislation. Unemployment insurance and progressive income taxes are the primary examples: as GDP falls, tax receipts drop and benefit payments rise, injecting demand back into the economy. The US Congressional Budget Office estimates automatic stabilisers offset roughly 10% of any GDP decline.
Bear Market
A sustained decline of 20% or more in a broad equity index from its recent peak. Bear markets often precede or accompany recessions but are not the same thing: the S&P 500 can enter a bear market without a recession being declared, and recessions can occur without a 20% drawdown. The 2022 bear market (-25%) coincided with negative GDP in Q1-Q2 but NBER did not declare a recession.
Business Cycle
The recurring sequence of expansion (rising output, employment, and income), peak (maximum activity before contraction), recession (broad-based decline lasting months), and trough (the low point before recovery begins). The NBER Business Cycle Dating Committee is the official arbiter of US business cycle turning points. Post-WWII expansions average roughly 65 months; contractions average 10 months.
Consumer Confidence Index (CCI)
The Conference Board's monthly survey of 3,000 US households asking about present conditions and six-month expectations for business, jobs, and income. Values above 100 indicate more optimists than pessimists relative to 1985 baseline. CCI typically falls 3-6 months before a recession's official start as households anticipate job losses.
Consumer Price Index (CPI)
The Bureau of Labor Statistics' primary inflation gauge, tracking a fixed basket of goods and services purchased by urban consumers. Used to adjust Social Security benefits, tax brackets, and wage contracts. Core CPI excludes food and energy (more volatile components). Persistently elevated CPI can trigger rate hikes that slow growth into recession territory.
Credit Spread
The yield difference between corporate bonds and equivalent-maturity US Treasuries. Wider spreads signal that lenders demand more compensation for default risk, typically because they expect economic deterioration. High-yield spreads above 500-600 basis points historically correlate with elevated recession probability. During the March 2020 COVID shock, investment-grade spreads briefly exceeded 400 bps.
Cyclical Unemployment
Unemployment caused by reduced demand during an economic contraction, as opposed to structural unemployment (skills mismatch) or frictional unemployment (job searching). Cyclical unemployment is the primary driver of rising jobless rates in recessions. In the Great Recession it peaked near 7 percentage points above the structural rate.
Debt Deflation
A self-reinforcing spiral described by Irving Fisher in 1933: falling asset prices force debtors to sell assets to service debt, driving prices lower still, increasing the real burden of remaining debt. Debt deflation was the mechanism that turned the 1929 stock crash into the Great Depression and was a key risk in 2008-09 that the Federal Reserve sought to prevent through aggressive QE.
Deflation
A sustained decline in the general price level (negative CPI). Deflation increases the real value of debt, discourages consumption (why buy today if it will be cheaper tomorrow?), and can trap an economy in a low-growth equilibrium. The Fed targets 2% inflation partly to maintain a buffer against deflation. Japan's 'Lost Decade' was partly characterised by mild but persistent deflation.
Depression
An informal term for an unusually severe and prolonged recession. There is no official threshold or committee that declares depressions. Economists often reference 10% or greater peak-to-trough GDP decline lasting more than two years. The Great Depression (1929-1933) saw GDP fall roughly 27% and unemployment reach 25%. No modern event has qualified, though 2008-09 came closest.
Expansionary Fiscal Policy
Government action to stimulate GDP by increasing spending, cutting taxes, or both. The 2009 American Recovery and Reinvestment Act ($831 billion) and the 2020 CARES Act ($2.2 trillion) are modern examples. The CBO estimated the ARRA raised employment by 1.4-3.3 million jobs at peak effect. Critics argue multipliers shrink when monetary policy is not accommodative.
Expansionary Monetary Policy
Central bank actions to lower borrowing costs and increase money supply: cutting the federal funds rate, forward guidance, quantitative easing, or lending facilities. The Fed cut rates to 0-0.25% in both 2008 and 2020 within weeks of recession onset. Between 2008 and 2014 the Fed's balance sheet grew from $900 billion to $4.5 trillion via QE programmes.
Federal Funds Rate
The overnight interest rate at which US banks lend reserves to one another, targeted by the Federal Open Market Committee (FOMC). It anchors the entire US interest-rate structure: higher fed funds rates raise mortgage rates, auto loan rates, and corporate borrowing costs. The Fed has cut this rate at the start of every post-WWII recession to provide monetary stimulus.
FRED
The Federal Reserve Bank of St. Louis's Federal Reserve Economic Data database. FRED aggregates over 800,000 economic time series from 100+ sources including BLS, BEA, Census Bureau, and international agencies. Free public access at fred.stlouisfed.org. All recession indicators on this site are sourced from FRED.
Full Employment
The level of employment consistent with stable inflation, sometimes called the 'natural rate of unemployment' or Non-Accelerating Inflation Rate of Unemployment (NAIRU). The CBO estimates the US NAIRU at roughly 4.5%. Unemployment below this level tends to generate wage-price pressure; above it, slack. Recessions push unemployment well above NAIRU.
GDP (Gross Domestic Product)
The total market value of all final goods and services produced within a country's borders in a given period. The BEA publishes US GDP quarterly, with advance, second, and third estimates. GDP growth is one of NBER's six primary recession indicators. Two consecutive quarters of negative GDP growth is the informal 'two-quarter rule', though NBER uses a broader framework.
GNP (Gross National Product)
The total output of goods and services produced by a country's residents, regardless of where produced. GNP = GDP + net income from abroad. The BEA used GNP as the headline output measure until 1991. Ireland's GDP can differ significantly from GNP because multinational profit-repatriation inflates its GDP figures.
Hardship Index
An informal measure sometimes defined as the sum of the unemployment rate and the inflation rate (also called the Misery Index, first used by economist Arthur Okun). Higher values indicate greater household economic stress. The US Misery Index peaked at 21.98 in June 1980 and reached 12-13 during the early 2022 inflation surge.
Housing Starts
The number of new residential construction projects begun each month, reported by the Census Bureau. A leading indicator tracked by NBER because construction activity signals business investment confidence and future consumer spending on appliances and furniture. Housing starts fell 75% peak to trough between 2006 and 2009, among the sharpest drops in any indicator.
Industrial Production Index (IPI)
The Federal Reserve's monthly measure of output from manufacturing, mining, and electric/gas utilities. One of NBER's six primary recession indicators. IPI peaked in September 2007, before the official December 2007 recession start, making it an early-warning indicator. During COVID-19, IPI fell 16% in April 2020 alone.
Initial Jobless Claims
The weekly count of new unemployment insurance claims filed with state agencies, reported every Thursday by the Department of Labor. The most timely US labour market indicator, with only a one-week lag. Claims typically rise several weeks before a recession is confirmed. The 52-week average is a useful smoother; sustained readings above 300,000 historically signal recession risk.
Inverted Yield Curve
When short-term Treasury yields exceed long-term yields, the yield curve is said to be inverted. The 10-year minus 2-year spread is the most watched gauge. Inversion has preceded every US recession since 1955 with no false positives. The typical lead time is 12-24 months. As of April 2026, the 10Y-2Y spread has turned slightly positive (+0.21%), suggesting declining near-term recession risk.
ISM PMI (Manufacturing)
The Institute for Supply Management's Purchasing Managers' Index for manufacturing, based on a monthly survey of supply chain executives. Readings above 50 indicate expansion; below 50 indicate contraction. PMI is forward-looking (it captures new orders, production, and employment intentions) and typically leads GDP by 1-2 quarters. April 2026 reading: 48.3.
Keynesian Economics
The school of macroeconomic thought founded by John Maynard Keynes in 'The General Theory' (1936), arguing that aggregate demand drives output and employment, and that government spending can offset private-sector shortfalls. Keynesian stimulus programmes (ARRA, CARES Act) draw on this framework. New Keynesian models incorporate price rigidities and are the foundation of most central-bank forecasting models.
Labour Force Participation Rate
The share of the civilian non-institutional population aged 16+ that is either employed or actively seeking work. A falling unemployment rate can be misleading if it reflects discouraged workers leaving the labour force rather than job gains. The participation rate fell from 66.4% in 2007 to 62.4% by 2015, complicating post-Great Recession unemployment comparisons.
Leading Economic Indicators (LEI)
The Conference Board's composite index of 10 forward-looking measures including stock prices, building permits, manufacturing orders, and credit spreads. Historically reliable: six consecutive monthly LEI declines have preceded every recession since 1960. The LEI began falling in early 2022 and sustained declines through 2023 despite no official recession being declared.
Liquidity Trap
A situation in which monetary policy loses effectiveness because interest rates are already near zero (or negative) and further rate cuts cannot stimulate borrowing. Keynes coined the term; it became policy-relevant again after 2008 when the Fed held rates at 0-0.25% for seven years. Japan has operated near the liquidity trap constraint since the early 1990s.
Manufacturing PMI vs Services PMI
Two separate ISM surveys covering roughly 11% (manufacturing) and 88% (services) of the US economy. Services PMI became more important as the economy shifted away from goods production. A contraction in manufacturing PMI is less alarming today than in 1980. Sustained sub-50 readings in both simultaneously are a strong recession signal.
Monetary Tightening
Central bank actions to reduce inflation by raising interest rates or shrinking the money supply. The Fed raised the federal funds rate from 0.25% to 5.50% between March 2022 and July 2023, the fastest tightening cycle since 1981. Aggressive tightening increases the probability of a 'hard landing' (recession) but can sometimes achieve a 'soft landing' (inflation falls without recession).
NBER (National Bureau of Economic Research)
A private, non-profit research organisation that serves as the official arbiter of US business cycle dates. NBER's Business Cycle Dating Committee of eight economists uses six monthly indicators to identify recession peaks and troughs. Declarations typically come 6-21 months after the actual turning point. NBER does not define recessions as two consecutive negative GDP quarters.
NBER Business Cycle Dating Committee
Eight senior economists appointed by the NBER Board who collectively review six primary indicators to date US recession peaks and troughs. Members include faculty from Harvard, MIT, Stanford, and other research universities. The committee meets informally and announces dates with no fixed schedule. There is no formal vote; decisions are by consensus.
Output Gap
The difference between actual GDP and potential GDP (the level consistent with full employment and stable inflation). A negative output gap means the economy is producing below capacity, implying unemployment above NAIRU and disinflationary pressure. The CBO estimated a negative output gap of roughly -4.5% of potential GDP at the 2009 Great Recession trough.
Okun's Law
The empirical relationship between GDP growth and unemployment changes, established by economist Arthur Okun in 1962. The rule of thumb: for every 1 percentage point rise in the unemployment rate, GDP falls roughly 2 percentage points below potential. Modern estimates suggest the ratio is closer to 1:1.5 to 1:2. Useful for back-of-envelope recession severity estimates.
Payroll Employment
Monthly net job creation (or losses) in the non-farm sector, reported by the Bureau of Labor Statistics in the Employment Situation Summary (the 'jobs report', released the first Friday of each month). One of NBER's six primary indicators. Three consecutive months of payroll declines is a reliable recession signal. During COVID-19, payrolls fell 22.4 million in March-April 2020.
Personal Consumption Expenditures (PCE)
The broadest measure of US household spending, reported monthly by the BEA. One of NBER's six primary indicators. The Fed targets core PCE inflation (excluding food and energy) at 2% rather than CPI. PCE weights are updated more frequently than CPI and cover a broader set of goods and services, including healthcare paid by insurers.
Potential GDP
The level of output an economy can sustain at full employment without generating inflationary pressure. Estimated by the Congressional Budget Office using a production-function model. Recessions widen the gap between actual and potential GDP; recoveries narrow it. Potential GDP can itself be permanently reduced by recessions through 'hysteresis' effects on labour force participation.
Quantitative Easing (QE)
A non-conventional monetary policy tool in which a central bank purchases long-term securities (Treasuries, mortgage-backed securities) to inject liquidity and lower long-term rates when the short-term policy rate is already at zero. The Fed deployed QE in 2008, 2010, 2012, and 2020. Total Federal Reserve asset purchases exceeded $4 trillion between 2008 and 2022.
Real GDP
GDP adjusted for inflation, using a base year price index. Real GDP allows comparisons across time by stripping out price changes. The BEA uses chain-weighted deflation. Real GDP growth is the metric most people mean when discussing whether the economy 'grew' or 'shrank'. A recession involves a significant decline in real GDP over multiple months.
Real Personal Income
Total pre-tax personal income adjusted for inflation. Includes wages, proprietors' income, rental income, dividends, interest, and government transfers. One of NBER's six primary recession indicators. Income net of government transfers (PILT) is preferred because it strips out fiscal stimulus that can maintain income even as the underlying economy weakens.
Recession
A significant decline in economic activity that is spread across the economy and lasts more than a few months, as defined by NBER. NBER uses six primary indicators: real personal income less transfers, non-farm payrolls, employment level, real personal consumption, real wholesale-retail sales, and industrial production. Depth, diffusion, and duration are all weighed; no single metric is determinative.
Recovery
The phase of the business cycle following a recession trough in which economic output, employment, and income rise back toward previous peak levels. Recoveries can be V-shaped (rapid rebound), U-shaped (extended low-growth period), W-shaped (double-dip), or L-shaped (prolonged stagnation). The 2020 COVID recession produced a sharp V-shaped recovery aided by $5+ trillion in fiscal stimulus.
Sahm Rule
A recession-detection indicator created by former Fed economist Claudia Sahm. The rule triggers when the three-month moving average of the national unemployment rate rises 0.5 percentage points above its low from the prior 12 months. It has triggered at the start of every US recession since 1970 with zero false positives. Current reading: 0.47 (below 0.5 threshold). April 2026.
Soft Landing
A scenario in which the Federal Reserve successfully raises interest rates enough to reduce inflation without triggering a recession. Genuinely rare: the Fed achieved a credible soft landing in 1994-95 under Alan Greenspan, and arguably in 2023-24 (though debate continues). Most aggressive tightening cycles have ended in recession.
Stagflation
The simultaneous occurrence of high inflation and high unemployment, historically considered theoretically impossible under the Phillips Curve framework. Stagflation in 1973-75 and 1979-80 was driven by oil supply shocks and forced a rethinking of macroeconomic consensus. Modern supply-side inflation (COVID disruptions, 2021-22) renewed stagflation concerns.
Structural Unemployment
Unemployment resulting from a mismatch between workers' skills and the skills employers need, or from workers being in the wrong geographic location. Unlike cyclical unemployment, structural unemployment persists even in a strong economy. Automation and globalisation have increased structural unemployment in manufacturing. Training, relocation subsidies, and education are the policy remedies.
Treasury Yield Curve
A graph plotting the yields of US government bonds across maturities from 1 month to 30 years. In a normal economy, longer-maturity bonds yield more (upward slope) because investors demand term premium. When the curve inverts (short rates above long rates), it signals that investors expect lower future growth and/or Fed rate cuts. The NY Fed uses the 10-year minus 3-month spread in its recession probability model.
Trough
The lowest point of a business cycle, marking the end of a recession and the beginning of recovery. NBER identifies troughs retrospectively. The Great Recession trough was June 2009, announced in September 2010. The COVID-19 recession had its trough in April 2020, announced in July 2021. Trough-to-peak represents the full expansion phase.
Two-Quarter Rule
The widely repeated but technically incorrect idea that a recession requires two consecutive quarters of negative GDP growth. This definition is used by some international bodies (including the UK and eurozone) but not by the US NBER, which uses a broader set of indicators. 2022 Q1 and Q2 both showed negative GDP, yet NBER did not declare a recession because employment, income, and spending remained strong.
U-3 Unemployment Rate
The headline unemployment rate as reported by the BLS: the number of people who are jobless, available for work, and have actively looked for a job in the past four weeks, expressed as a percentage of the labour force. U-3 is the most-cited rate. It does not count marginally attached workers or part-time workers who want full-time work.
U-6 Unemployment Rate
The broadest BLS unemployment measure, including: U-3 unemployed + marginally attached workers (those who want work but have not searched recently) + people working part-time for economic reasons. U-6 is consistently 3-6 percentage points above U-3 and provides a better picture of labour market slack. During the Great Recession, U-6 peaked at 17.2% vs U-3's 10.0%.
Wholesale Trade Sales
Monthly data on sales of durable and non-durable goods by merchant wholesalers, reported by the Census Bureau. One of NBER's six primary recession indicators because wholesalers sit between manufacturers and retailers, making their sales sensitive to inventory adjustments and future consumer demand. A sustained decline in wholesale sales often precedes broader economic contraction.
Yield Spread
The difference in yield between two fixed-income securities. The most recession-relevant spread is 10-year Treasury yield minus 2-year Treasury yield (10Y-2Y). When this spread turns negative (inversion), a recession has historically followed within 12-24 months. As of April 2026, the 10Y-2Y spread is +0.21%, having recently emerged from 27 months of inversion. Whether this signals genuine recovery or a brief pre-recession steepening is debated.
Zero Lower Bound (ZLB)
The practical constraint on conventional monetary policy when the short-term interest rate approaches zero. Below zero, cash becomes preferable to bank deposits (since cash has a nominal zero return). The Fed has held rates near zero from December 2008 to December 2015 and again from March 2020 to March 2022. The ZLB forces central banks to rely on unconventional tools like QE and forward guidance.