Equilon FXKeep these questions in view.
- Real or nominal
- Quarterly, annualised or year-over-year
- Advance, second or third estimate
- Components and revisions
Use Full reading for the reasoning, worked example and original references.
Output over a period
GDP measures the value of final goods and services produced within an economy. Current-dollar GDP uses prices in the period; real GDP adjusts for price changes. A nominal growth number therefore cannot be read as an equal increase in the volume of output.
Annualised is a convention
US quarterly GDP growth is commonly presented at an annual rate. This expresses what a quarter’s pace would imply if repeated for a year. It is not the same as the observed change over the latest four quarters. Read the units before comparing US quarterly figures with differently presented foreign data.
The estimate has a stage
BEA publishes advance, second and third estimates for a quarter as additional information becomes available. Those are updates to the same reference period, not three new quarters. Broader updates can also revise history. Label the vintage when discussing what was known at a particular moment.
Composition changes interpretation
The headline can combine different contributions from consumption, investment, government activity and trade. A discussion of underlying demand needs that composition. Avoid turning one aggregate into an all-purpose statement about household conditions, productivity or future inflation.
One quarter, two ways to express it
A hypothetical 1% increase over a quarter corresponds to about 4.06% at an annualised pace: 1.01 to the fourth power, minus one. Neither number establishes the actual growth that will occur in the following three quarters.
What kind of statement is this?
Bureau of Economic Analysis / Quarterly reference periods; successive estimates / Levels, growth rates and contributions
Separate output, prices, the rate convention and the stage of the estimate.
This material does not establish a future policy decision, a live exchange rate or the direction of the next market move. Those questions require dated evidence and a specific comparison.
Real GDP grows 1% in a quarter. What is the compound annualised rate?
Keep the language clear Three useful definitions
Annualised growth — A rate expressed as if a change over a shorter interval repeated for a year. Quarterly growth q becomes (1 + q)⁴ − 1; it is not a year-over-year observation. Read more ↗
Nominal — Expressed without adjusting for changes in purchasing power. State the currency and period alongside a nominal return. Read more ↗
Revision — An update to an earlier published value. Read revisions alongside the newest observation when a release includes them. Read more ↗
Original references.
Institutional descriptions were prepared against these references for this edition. Follow the source for current decisions, releases and methodology. Numerical examples on this page are illustrative.