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Nominal versus real GDP practice
Nominal GDP uses current prices, while real GDP holds prices to a chosen reference basis to separate price changes from changes in measured output. A simple fixed-base exercise makes the distinction visible.
By ExamCat · Original study lesson · Published September 24, 2026
Understand the method
Multiply quantities by the appropriate prices before adding products. GDP concerns final production within an economy during a period; it is not every transaction or a complete measure of well-being. Official statistics use more detailed methods than this one-good illustration.
Worked example, step by step
An invented economy produces 100 units at $5 in year 1 and 120 units at $6 in year 2. Use year 1 prices as the fixed base.
- Year 1 nominal GDP is 100 × $5 = $500.
- Year 2 nominal GDP is 120 × $6 = $720.
- Year 2 real GDP at year 1 prices is 120 × $5 = $600.
- Output grew 20%, while nominal value grew 44%. The difference reflects the price increase in this example.
A mistake to watch for
A rise in nominal GDP does not by itself prove that more goods were produced. Also, higher aggregate real output does not establish that every resident’s living standard improved.
Try it yourself: three questions
Write an answer before opening the explanation. For calculations, keep your units and intermediate steps; for concepts, state the reason for your choice.
1. If quantity stays 100 but price rises from $5 to $7, what happens to fixed-base real GDP?
Show answer and explanation
It stays $500 using the $5 base price. Nominal GDP rises to $700.
2. What is real GDP per person if real GDP is $600 and population is 10?
Show answer and explanation
$60 per person under the model. This is an average, not each person’s income.
3. Why avoid counting an intermediate input and the final product in full?
Show answer and explanation
Doing so can double-count the input’s contribution. Final-product accounting or value-added accounting addresses this issue.
Build your next practice session
Mark the first step where your reasoning differed from the explanation. Turn that step into a question, answer it without looking, then change one condition in the example and explain what would change. A correct guess is a reason to revisit the method.
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