National income statistics
National income statistics: build the core model, apply it to evidence and qualify conclusions where outcomes depend on context.
9708 section 4.1; AS Level. Checked against Cambridge's 2026–2028 Version 2 (latest version published December 2025) and 2029 Version 1 (published September 2026). Cambridge states that neither version has significant changes affecting teaching. Always follow the syllabus for the candidate's examination year.
Before you begin
Work on paper. Try each question before revealing help, and explain why your method works.
Quick readiness check
How is net domestic product obtained from gross domestic product on a consistent price basis?
What you will learn
- Explain national income and distinguish GDP, GNI and NNI
- Adjust measures between market and basic prices
- Distinguish gross and net measures
- Recognise limits of national income comparisons
Core model and terms
GDP measures production within a country’s borders; GNI adjusts for net primary income from abroad; NNI deducts consumption of fixed capital from a gross measure. National income statistics estimate economic activity, but revisions, informal production and population size affect interpretation.
Apply and evaluate
To convert a market-price measure to basic prices, subtract taxes on products and add subsidies on products. To move from gross to net, deduct consumption of fixed capital. Keep the measure, price basis and time period explicit before comparing countries or years.
Pause and explain
Which statement best applies national income statistics?
Worked example
GDP at market prices is $520 billion. Product taxes are $35 billion, product subsidies $5 billion and depreciation $40 billion. Find GDP at basic prices and NDP at basic prices.
Show the worked solution
- Basic-price GDP = 520 − 35 + 5 = $490bn
- Net domestic product = 490 − 40
- NDP at basic prices is $450bn
Answer Basic-price GDP = 520 − 35 + 5 = $490bn → Net domestic product = 490 − 40 → NDP at basic prices is $450bn
Try a topic test
Choose Easy, Normal or Difficult. Save your answers and open worked review after finishing.
Test this topic →From guided practice to a new situation
Write your answer and reasoning first. Use a hint only if you are stuck. The model solution is for self-checking; your written work is not automatically marked.
GDP at market prices is $520 billion. Product taxes are $35 billion, product subsidies $5 billion and depreciation $40 billion. Find GDP at basic prices and NDP at basic prices.
Give me a hint
Adjust market to basic prices first, then gross to net.
Compare my reasoning
- Basic-price GDP = 520 − 35 + 5 = $490bn
- Net domestic product = 490 − 40
- NDP at basic prices is $450bn
Basic-price GDP = 520 − 35 + 5 = $490bn Net domestic product = 490 − 40 NDP at basic prices is $450bn
Look for these in your work
- Basic-price GDP = 520 − 35 + 5 = $490bn
- Net domestic product = 490 − 40
- NDP at basic prices is $450bn
A country’s firms receive more primary income from abroad than residents pay abroad. Compare GNI with GDP, other things equal.
Give me a hint
GNI adjusts domestic production for net primary income from abroad.
Compare my reasoning
- Net primary income from abroad is positive
- GNI adds this net flow to GDP
- GNI exceeds GDP, other things equal
Net primary income from abroad is positive GNI adds this net flow to GDP GNI exceeds GDP, other things equal
Look for these in your work
- Net primary income from abroad is positive
- GNI adds this net flow to GDP
- GNI exceeds GDP, other things equal
Why might rising real GDP per person still fail to show whether every household is better off?
Give me a hint
Consider distribution and non-market dimensions.
Compare my reasoning
- The average can rise while gains are uneven
- National accounts do not show each household’s share
- Health, leisure and environmental quality also need separate evidence
The average can rise while gains are uneven National accounts do not show each household’s share Health, leisure and environmental quality also need separate evidence
Look for these in your work
- The average can rise while gains are uneven
- National accounts do not show each household’s share
- Health, leisure and environmental quality also need separate evidence
A learner subtracts depreciation before adjusting GDP from market to basic prices. Explain why sequence and labels matter.
Give me a hint
Keep the gross/net and market/basic adjustments distinct.
Compare my reasoning
- Market to basic adjusts product taxes and subsidies
- Gross to net subtracts fixed-capital consumption
- State both steps to avoid mixing bases or counting an adjustment incorrectly
Market to basic adjusts product taxes and subsidies Gross to net subtracts fixed-capital consumption State both steps to avoid mixing bases or counting an adjustment incorrectly
Look for these in your work
- Market to basic adjusts product taxes and subsidies
- Gross to net subtracts fixed-capital consumption
- State both steps to avoid mixing bases or counting an adjustment incorrectly
Common mistakes
- Comparing GDP, GNI and NNI without checking borders, net income from abroad, price basis, depreciation or population.
What can you explain now?
How is net domestic product obtained from gross domestic product on a consistent price basis?
Compare with the explanation
Subtract consumption of fixed capital
The deduction converts a gross measure to a net measure.
After trying it yourself, choose your next review. This is your self-assessment.
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Make it stick
Before moving on, explain the central idea in national income statistics and state one condition that could change its effect.
If you needed the solution, close it and solve the problem again from a blank page. A correct answer is stronger when you can explain the reason for each step.