Questions: Real vs. Nominal GDP and the GDP Deflator

Question 1

Country X reports nominal GDP growth of 6% for the year. Inflation as measured by the GDP deflator was 8% over the same period. What happened to real GDP?

• A. Real GDP grew by 14% — the two effects add together
• B. Real GDP grew by approximately 2%
• C. Real GDP shrank by approximately 2%
• D. Real GDP stayed the same — nominal GDP captures all the relevant information

Answer: (C)

Real GDP growth ≈ nominal GDP growth − inflation. Here, 6% − 8% = −2%, meaning the economy actually produced slightly less even though the dollar value of output rose. This is why the distinction matters: nominal GDP can rise during a recession if prices rise fast enough. Country X's economy was shrinking in real terms despite positive nominal growth.

Question 2

In year 1 (base year), an economy produces only widgets: 100 units at $5 each. In year 2, it produces 120 widgets at $7 each. What is the GDP deflator in year 2?

• A. 100 — because year 1 is the base year and deflators start at 100
• B. 120 — because output quantity grew by 20%
• C. 140 — nominal GDP is $840 and real GDP at base-year prices is $600
• D. 117 — because nominal GDP grew by approximately 17%

Answer: (C)

Nominal GDP (year 2) = 120 × $7 = $840. Real GDP (year 2, using base-year prices) = 120 × $5 = $600. GDP deflator = (840/600) × 100 = 140. Prices are 40% above the base year. Option B confuses quantity growth with the deflator — the deflator measures prices, not output volume.

Question 3

If nominal GDP grows by 9% and real GDP grows by 4% over the same period, we can infer that the GDP deflator rose by approximately 5%.

• T. True
• F. False

Answer: True

Nominal GDP growth ≈ real GDP growth + inflation (deflator growth). Rearranging: deflator growth ≈ nominal growth − real growth = 9% − 4% = 5%. This approximation is foundational in macroeconomics and underpins analogous real/nominal distinctions for wages, interest rates, and exchange rates.

Question 4

Real GDP adjusts nominal GDP to reflect prices in today's dollars, making historical comparisons more meaningful.

• T. True
• F. False

Answer: False

Real GDP adjusts to base-year prices — not today's prices. The base year is a fixed reference point. 'Real' means 'holding prices constant at the base year,' which removes the distortion of inflation over time, but the prices used are historical, not current. This is a common misreading of the word 'real.'

Question 5

Why can't nominal GDP alone tell us whether an economy is actually producing more goods and services over time?

Model answer: Nominal GDP is measured in current prices, so it rises whenever either output quantities increase OR prices increase. A rise in nominal GDP could reflect genuine growth (more production) or simply inflation (the same production at higher prices) — or both at once. To isolate true changes in production volume, we hold prices fixed at a base year (real GDP), removing the confounding effect of price changes.

A wartime economy with severe shortages but hyperinflation can show rising nominal GDP while citizens are worse off. An economy producing identical output year-over-year shows rising nominal GDP whenever prices rise. Real GDP strips out the price effect so that comparisons across time reflect genuine changes in what the economy produces.