Real vs Nominal GDP
Nominal GDP measures output in current dollars; real GDP holds the price level constant. The growing gap between them is inflation accumulating year after year.
- Real GDP
- Nominal GDP
Nominal GDP is what you read in the headlines — "the U.S. economy is now $29 trillion." That figure includes both real output growth and price growth. If output stayed flat but every price doubled, nominal GDP would double too.
Real GDP strips that out by re-pricing all output in constant dollars (currently chained 2017 dollars). The Bureau of Economic Analysis publishes both. The difference between them — the GDP deflator — is one of the broadest inflation measures available, covering everything the economy produces rather than just consumer purchases.
Over 20 years, the gap is striking. Real GDP grows ~2–3% per year in trend. Nominal GDP grows ~5% in trend. The compounding 2% wedge IS the price level. Indexing both series from a common starting point shows real growth flat (with recessions) underneath a steady upward nominal trajectory.
The gap widens during inflationary periods. From 2021 to 2023, nominal GDP outpaced real GDP by roughly 6 percentage points per year — the highest sustained gap since the early 1980s. That gap is the GDP deflator inflation, and it's why "the economy is growing" looked very different in headlines than in household purchasing power.
Real GDP is what economists watch for cycle dating and productivity analysis. Nominal GDP is what determines tax revenue, debt-to-GDP ratios, and corporate sales growth.
Frequently asked questions
What is the difference between real and nominal GDP?
Nominal GDP measures output in current dollars and includes inflation; real GDP re-prices all output in constant dollars (currently chained 2017 dollars) to strip inflation out. The difference between them — the GDP deflator — is one of the broadest inflation measures available, covering everything the economy produces rather than just consumer purchases.
Which GDP measure should I use?
Economists watch real GDP for cycle dating, growth, and productivity analysis because it reflects actual output. Nominal GDP is what determines tax revenue, debt-to-GDP ratios, and corporate sales growth, since those are denominated in current dollars. From 2021–23 nominal outpaced real GDP by ~6 points per year — the widest gap since the early 1980s — which is why headline growth looked very different from household purchasing power.
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