Measure growth and assess its costs and policies
Use real GDP to discuss growth, recession, causes, consequences and policy responses.
Section 4.5 · Economic growth
Cambridge IGCSE Economics 0455 / IGCSE (9–1) Economics 0987, 2027–2029 Version 1. Apply each model to the stated evidence and qualify conclusions where effects depend on context. Practice is original and self-checked; it is not a Cambridge paper, mark scheme or official grade.
Before you begin
- No prior economics study is assumed. Read the scenario for the decision-maker, the market or economy involved, the time period and the evidence supplied.
Work on paper. Try each question before revealing help, and explain why your method works.
Quick readiness check
What can increase real GDP through productive capacity?
What you will learn
- Define and measure growth
- Explain growth and recession causes
- Evaluate policies to promote growth
Real GDP tracks output at constant prices
Economic growth is an increase in real output over time. Real GDP adjusts for price changes; comparing nominal GDP alone can confuse higher prices with higher production.
GDP measures production within an economy over a period, not wellbeing in full. Real GDP per head and other indicators can provide additional context.
Demand and productive capacity both matter
Growth can result from higher total demand or increases in the quantity or quality of resources. It may raise incomes and employment, but can also add inflation, inequality or environmental pressure.
A recession is a period of falling real GDP under the definition used by the syllabus. Lower demand or productive capacity can cause it. Policies to promote growth may include fiscal, monetary and supply-side measures, with different time lags and trade-offs.
Pause and explain
Why might growth conflict with environmental sustainability?
Worked example
Nominal GDP rises 8% while the price level rises 5%. Explain why real output growth is smaller than the nominal change.
Show the worked solution
- Nominal GDP includes price and quantity changes.
- The price rise accounts for part of the nominal increase.
- Real GDP adjusts for price changes; exact calculation depends on the index method.
Answer Real output growth is below the 8% nominal increase because part of the change reflects higher prices. The exact real rate depends on the deflator and calculation convention.
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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.
Real GDP rises from $500 billion to $525 billion. Calculate the percentage growth rate.
Give me a hint
Find the change, divide by the starting value and multiply by 100.
Compare my reasoning
- Change = 25 billion.
- 25 ÷ 500 = 0.05.
- Convert to 5%.
Real GDP growth is 5% over the period.
Look for these in your work
- Change correct
- Base value correct
- Percentage stated
A recession reduces sales at firms and tax revenue for government. Explain one effect on households and one fiscal challenge.
Give me a hint
Trace lower output to jobs and public revenue.
Compare my reasoning
- Firms may reduce hours or employment.
- Household incomes may fall.
- Lower tax revenue can make support or spending harder to fund.
Households may face lower income if hours or jobs are cut. The government may have less revenue while demand for support rises, creating a budget trade-off.
Look for these in your work
- Household effect explained
- Revenue effect explained
- Fiscal challenge stated
A country can choose between a short-term spending expansion and long-term skills investment to promote growth. Compare one likely timing difference and one risk.
Give me a hint
Distinguish demand effects from capacity effects.
Compare my reasoning
- Spending may raise demand relatively quickly.
- Skills investment may improve capacity over a longer period.
- Each can be poorly targeted or create costs.
Spending can support demand sooner if spare capacity exists, while skills investment may take longer but improve productivity. Poor targeting, inflation or training that misses labour needs are risks to assess.
Look for these in your work
- Timing compared
- Demand/supply distinction made
- Risks identified
Common mistakes
- Treating nominal GDP growth as real growth
- Assuming GDP growth improves every household's living standard equally
- Using a recession label without the definition or period
What can you explain now?
What does real GDP measure?
Compare with the explanation
Output adjusted for price changes
The adjustment separates quantity growth from inflation.
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Make it stick
What does real GDP measure?
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