US Recession Odds: How Markets Price the Risk of a Downturn
A US recession market is a prediction market asking whether the world's largest economy will tip into a downturn, usually within a calendar year. The probability you see is the crowd's running estimate of that risk, not a forecast you should act on. This hub explains how a recession is officially defined, the indicators traders and economists track, how these markets actually resolve, and why calling the timing is genuinely hard. Prediction-market prices are probabilities, not advice.
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What counts as a recession: NBER vs. the two-quarter rule
There are two competing ideas of what a recession is, and they do not always agree. The official US arbiter is the National Bureau of Economic Research (NBER), a private nonprofit. Its Business Cycle Dating Committee defines a recession as a significant decline in economic activity spread across the economy, lasting more than a few months, and normally visible in production, employment, real income, and other indicators. The committee weighs three things: the depth of the contraction, its duration, and how broadly the decline spreads across sectors (what it calls diffusion). It treats these as somewhat interchangeable, so an extreme reading on one can offset a weaker reading on another.
The more famous shorthand is the two-quarter rule: two consecutive quarters of falling real GDP. That rule traces to economist Julius Shiskin, who offered it in a December 1974 New York Times article as one of several rules of thumb, not as an official definition. It is a useful screen but produces false signals. The two-month COVID-19 recession in early 2020 was too short to register two full quarters, yet the NBER still dated it a recession. Conversely, GDP can dip for two quarters without the NBER ever declaring one. Knowing which definition a given market uses is the single most important thing before reading its odds.
The indicators markets watch
Recession probabilities move on data. A few signals carry outsized weight.
The yield curve. This plots interest rates on US Treasury securities across maturities. It normally slopes upward, with longer-term debt paying more. When short-term yields rise above long-term yields, the curve is inverted, which has historically preceded many US recessions. The yield curve reflects investor expectations about the future, which is why it is treated as a leading signal rather than a snapshot of today.
The labor market. The Sahm Rule, developed by economist Claudia Sahm, flags a likely recession when the national unemployment rate's three-month average rises 0.5 percentage points or more above its lowest point in the prior 12 months. It has historically triggered in US recessions since 1950, typically about three months after the downturn began, though it has also thrown occasional false signals. Crucially, it identifies a recession that has likely already started rather than forecasting one.
GDP and output. Real GDP, industrial production, real income, and consumer spending show the current health of the economy. They confirm a downturn but lag the leading signals.
How a recession market resolves
Resolution rules vary by platform and by the specific contract, so always read the rules before trusting the price. Most recession markets resolve on one of two bases.
NBER-based markets resolve YES only if the Business Cycle Dating Committee formally declares (and dates) a recession overlapping the contract window. This is authoritative but slow: the NBER is deliberately retrospective and waits for revised data, so it often confirms a recession many months after it began, and dates a peak only once it is confident a contraction occurred.
Rule-based markets resolve on a mechanical trigger, most commonly two consecutive quarters of negative real GDP growth as reported by the Bureau of Economic Analysis, sometimes pegged to advance or revised estimates. These settle faster but can diverge from the official NBER call. Because the two definitions can disagree, the same economy can produce a YES on one market and a NO on another over the identical period. The resolution source and date cutoff are what actually determine payout.
Why timing is hard
Recessions are easy to recognize in hindsight and notoriously hard to time in advance. The leading indicators warn that risk is elevated but not when a downturn will start; the yield curve has inverted well before recessions and also ahead of false alarms. The lagging indicators only confirm a downturn after it is underway. The official scorekeeper, the NBER, adds its own delay by waiting for clean data before dating a turning point.
This is why recession odds swing on each jobs report, GDP release, and Federal Reserve decision, and why a market can sit at moderate probability for a long stretch. A reading like 35 percent does not mean a recession is coming or not coming; it means the crowd judges roughly one-in-three odds over the contract window. Treat the number as a continuously updated gauge of risk, read it against the resolution rule and the underlying data, and remember it is a probability, not a prediction you should trade your finances on.
Frequently asked questions
Who officially decides if the US is in a recession?
The National Bureau of Economic Research (NBER), a private nonprofit, is the recognized US arbiter. Its Business Cycle Dating Committee dates recessions by weighing the depth, duration, and breadth of a decline across indicators like employment, income, output, and spending. It works retrospectively and often confirms a recession months after it began.
Is two quarters of negative GDP an official recession?
No. The two-quarter rule is a rule of thumb, popularized from a 1974 suggestion by economist Julius Shiskin, not the official US definition. The NBER decides using a broad set of indicators. A downturn can be a recession without two negative quarters, as in early 2020, and two weak quarters do not guarantee an NBER call.
What does the yield curve have to do with recessions?
The yield curve plots Treasury interest rates across maturities. It usually slopes upward. When short-term yields exceed long-term yields, the curve inverts, which has historically preceded many US recessions. It reflects investor expectations, making it a leading signal, though it has also produced false alarms, so it warns of risk rather than guaranteeing a downturn.
What is the Sahm Rule?
The Sahm Rule, from economist Claudia Sahm, flags a likely recession when the three-month average unemployment rate rises 0.5 percentage points or more above its lowest point in the prior 12 months. It has historically triggered in US recessions since 1950, usually about three months in. It identifies a downturn already underway rather than forecasting one.
How does a US recession prediction market resolve?
It depends on the contract. NBER-based markets resolve YES only if the committee formally declares a recession in the window, which can take many months. Rule-based markets resolve on a mechanical trigger, often two consecutive quarters of negative real GDP. Because the definitions can disagree, always read the specific resolution source and date cutoff.