GDP
GDP measures the total value of goods and services an economy produces. Learn how it is calculated, real vs nominal GDP, release timing and how markets react.
Gross domestic product (GDP) is the broadest measure of an economy's output: the total market value of all final goods and services produced in a country over a period. It is the headline number for economic growth and the starting point for discussions about recessions, interest rates and corporate earnings. For traders, GDP releases matter less for the number itself, which describes the past, than for what it implies about central bank policy and the direction of the economy.
How GDP is calculated#
The most common approach adds up spending:
GDP = C + I + G + (X - M)| Component | Meaning | Share of US GDP (approx.) |
|---|---|---|
| C: consumption | Household spending on goods and services | About 68% |
| I: investment | Business investment, housing and inventories | About 17% to 18% |
| G: government spending | Government purchases (not transfer payments) | About 17% |
| X minus M: net exports | Exports minus imports | Usually negative for the US |
Approximate shares in recent years. Consumer spending dominates the US economy, which is why data on jobs and retail sales matter so much. See Retail Sales and Employment Data and Non-Farm Payrolls.
Real vs nominal GDP#
- Nominal GDP uses current prices.
- Real GDP removes the effect of inflation, showing changes in actual output.
real GDP growth ≈ nominal GDP growth - inflation (GDP deflator)Markets focus on real GDP growth.
How the US reports GDP#
The Bureau of Economic Analysis (BEA) releases quarterly GDP in three estimates:
| Estimate | Timing after quarter end | Notes |
|---|---|---|
| Advance | About 4 weeks | Most market moving; based on incomplete data |
| Second | About 8 weeks | Revised with more data |
| Third | About 12 weeks | Further revisions |
US growth is reported as a seasonally adjusted annualised rate (SAAR): the quarterly change compounded over a year.
GDP and recessions#
A popular rule of thumb defines a recession as two consecutive quarters of negative real GDP growth. In the US, the official arbiter is the National Bureau of Economic Research (NBER), which looks at a broader set of indicators including employment, income and production. The US had two negative quarters in the first half of 2022, but the NBER did not declare a recession because jobs and income kept growing. See Recession Indicators.
How markets react#
| GDP surprise | Typical reaction |
|---|---|
| Stronger than expected | Bond yields may rise (fewer rate cuts expected); currency may strengthen; stocks mixed |
| Weaker than expected | Bond yields may fall; currency may weaken; stocks mixed (bad news can be "good" if it means rate cuts) |
Because GDP is backward looking and revised, markets often react more to timelier data such as payrolls, purchasing managers' indices and inflation. See PMI and Trading Economic Releases.
GDPNow and nowcasts#
The Federal Reserve Bank of Atlanta's GDPNow model and similar "nowcasts" estimate current quarter growth in real time from incoming data. Traders watch them to anticipate the official release.
GDP and stocks#
Over long periods, corporate earnings grow roughly in line with nominal GDP, but the link between a single quarter's GDP and stock returns is weak. Markets look ahead; stocks often bottom before GDP data show recovery. See Business and Economic Cycles.
Frequently asked questions#
What is GDP?#
Gross domestic product: the total market value of all final goods and services produced in an economy over a period.
What is the difference between real and nominal GDP?#
Nominal GDP uses current prices; real GDP adjusts for inflation to show changes in actual output.
Why do markets care about GDP?#
It shows the economy's direction and influences expectations for interest rates, earnings and currencies, though timelier data often matter more.
Next, learn about rising prices in Inflation.
Sources#
- US Bureau of Economic Analysis, GDP
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