Cambridge International AS and A Level Economics: Economic growth: measurement, causes and consequences (9708)

This guide covers section 4.4 (Economic growth), outcomes 4.4.1 to 4.4.5, of the Cambridge International AS & A Level Economics 9708 syllabus for examination in 2026, 2027 and 2028. Topic 4 is AS Level content. A Level candidates study it too, and the syllabus treats AS content as assumed knowledge for A Level Papers 3 and 4. Every country, firm and figure below is invented for illustration. None is a real statistic.

Use the Cambridge A Level Economics hub for all topics and the printable checklist to track your coverage. Then work through the revision notes and the practice questions. For more macroeconomic questions see the macroeconomy practice set and the 9708 past papers guide. To find weak spots first, take a free 10-minute diagnostic.

What this guide covers

Outcome	What you must be able to do
4.4.1	Explain the meaning of economic growth
4.4.2	Explain how economic growth is measured, and calculate it
4.4.3	Distinguish growth in nominal GDP from growth in real GDP
4.4.4	Explain the causes of economic growth
4.4.5	Explain the consequences of economic growth

The syllabus gives these five statements without sub-bullets, so the detail below is built from the outcome wording. Some related ideas are separate A Level topics: actual versus potential growth, inclusive growth and sustainable growth appear in section 9.2, and the comparison of growth rates and living standards appears in section 11.3. This guide stays with 4.4 and points to those topics where they connect.

4.4.1 What economic growth means

Economic growth is an increase in the output of goods and services produced in an economy over time. You measure it as the percentage change in real national output, usually real GDP, from one period to the next. Two points matter:

• Growth is a rate of change, not a level. A rich country can grow slowly and a poor one quickly.
• Growth is about real output. A rise in prices alone is not growth.

Growth can be shown on a production possibility curve as an outward shift of the whole curve, or as a move from a point inside the curve towards it. The first needs more or better resources. The second only needs spare resources to be used. Section 4.3 links the same idea to the AD/AS model, used below.

4.4.2 Measuring economic growth

Real GDP is the standard measure from section 4.1. The growth rate is:

growth rate (%) = (real GDP in this period − real GDP in the previous period) / real GDP in the previous period × 100

Growth can also be measured with real GNI or real NNI, which are the other national income measures in 4.1.2. The method is the same. Growth is usually reported per year, but a year can be broken into quarters.

Worked example 1 (simple growth rate). Country A is an invented economy. Its real GDP was 640.0 billion currency units (cu bn) in Year 1 and 659.2 cu bn in Year 2.

• Change = 659.2 − 640.0 = 19.2
• Growth = 19.2 / 640.0 × 100 = 3.0%

Worked example 2 (per capita). Total growth can hide what happens to each person. Country C has real GDP of 2,400 cu bn and 12.0 million people in Year 1, and 2,472 cu bn and 12.24 million people in Year 2.

	Year 1	Year 2	Growth
Real GDP (cu bn)	2,400	2,472	3.0%
Population (million)	12.00	12.24	2.0%
Real GDP per person (cu thousand)	200.00	201.96	0.98%

Per person: 2,400 / 12.0 = 200.00 and 2,472 / 12.24 = 201.96 (to 2 d.p.). Growth = 1.96 / 200.00 × 100 = 0.98%. A quick estimate is 3.0 − 2.0 = 1.0 percentage point, but the exact figure is lower than that.

Worked example 3 (growth over several years). Country D has growth of 2%, 3% and 4% in three consecutive years. The growth rates do not simply add.

• Year 1: 500 × 1.02 = 510.0
• Year 2: 510.0 × 1.03 = 525.3
• Year 3: 525.3 × 1.04 = 546.312
• Total growth = (546.312 − 500) / 500 × 100 = 9.26%, not 9%.
• Average annual (compound) growth = 1.092624 to the power 1/3, minus 1, which is about 2.997% a year, just below the simple average of 3.0%.

Worked example 4 (index numbers). Real GDP can be shown as an index with a base year of 100. If growth is +5%, then −2%, then +4%, the index runs: Year 1 = 100, Year 2 = 105.0, Year 3 = 105.0 × 0.98 = 102.9, Year 4 = 102.9 × 1.04 = 107.016. Negative growth in Year 3 means output fell. Over the three years output rose by 7.0% (to 1 d.p.).

Worked example 5 (percentage versus absolute change). Country E has real GDP of 150 and grows by 6%. Country F has real GDP of 1,200 and grows by 2%.

• E adds 150 × 0.06 = 9. F adds 1,200 × 0.02 = 24.
• E grows faster in percentage terms, but F adds more output in absolute terms.

Difficulties in measuring growth. Treat these as reasons for caution, not as errors in the method.

• Output in the informal economy, and unpaid work such as childcare, is missing or estimated.
• Price indices may not capture quality improvements or changes in what people buy, so real GDP may be mis-stated.
• First estimates are often revised later.
• Population may be counted poorly, which affects per capita figures.
• GDP measures output, not the distribution of income, wellbeing or environmental damage, so a rise in GDP is not always a rise in living standards.

4.4.3 Nominal and real GDP

Nominal GDP values output using the prices ruling in the same year it is produced, also called current prices. Real GDP is adjusted for price changes, so it shows output at constant prices. Nominal GDP rises if output rises, if prices rise, or both. Real GDP changes only when output changes.

real GDP = nominal GDP / price index × 100

The price index is for the output of the whole economy, and the base year is 100.

Worked example 6 (nominal and real growth). Country B is invented. In Year 1 (the base year, price index 100) nominal GDP is 1,000 cu bn. In Year 2 the price index is 112 and nominal GDP is 1,164.8 cu bn.

• Nominal growth = (1,164.8 − 1,000) / 1,000 × 100 = 16.48%
• Real GDP, Year 2 = 1,164.8 / 112 × 100 = 1,040.0 cu bn
• Real growth = (1,040.0 − 1,000) / 1,000 × 100 = 4.0%
• Prices rose 12%, so 16.48% is mostly price rises. Taking 12 from 16.48 gives 4.48, which overstates real growth. Always deflate first and then calculate.

Nominal growth can be positive while real output falls. If nominal GDP rises 8% and prices rise 10%, real GDP changes by 1.08 / 1.10 − 1, which is about −1.8%.

4.4.4 Causes of economic growth

Link each cause to the mechanism. Use the AD/AS model from section 4.3 and the PPC to organise the answer.

Short-run growth through AD. A rise in consumption, investment, government spending or net exports shifts AD to the right. If there is spare capacity, real output rises and employment rises with little change in the price level. Near full capacity, more of the rise appears as a higher price level and real growth is small. This is growth from using resources more fully.

Long-run growth through AS. Sustained growth needs LRAS to shift to the right, which is the same as an outward PPC shift. The causes are:

Cause	Chain of reasoning
More labour (population, migration, higher participation)	more workers, so higher capacity, but output per head may not rise
Better-quality labour (education, training, health)	higher productivity per worker, so the same hours produce more
More capital (investment)	more machines and infrastructure raise output per worker; investment also adds to AD
Better technology	new methods and products raise output from the same inputs
More land or natural resources	new discoveries or more usable land enlarge the resource base
Institutions and incentives (stable rules, property rights, competition)	encourage firms and workers to invest and innovate

A rise in the quantity of resources raises total output. A rise in their quality raises output per worker, which is what raises output per head. Investment appears on both sides: it adds to AD when spent, and to AS once the capital is in use.

4.4.5 Consequences of economic growth

Consequences depend on the country, the source of the growth and who gains. Use the table to organise points, then evaluate.

Area	Possible benefit	Possible cost
Living standards	higher real incomes and more goods and services	GDP does not show leisure, health or wellbeing
Employment	more jobs as output rises	technology-led growth may remove some jobs
Government	tax revenue rises, so more spending on health and education	pressure for spending on roads and services
Prices	with spare capacity, little pressure on prices	demand-led growth near full capacity can bring inflation
Trade	more exports and higher incomes	higher incomes may raise imports and widen a trade deficit
Environment	richer countries can afford cleaner technology	more resource use, pollution and congestion
Distribution	poverty can fall as incomes rise	gains may go mainly to the already rich, so inequality may widen

Chain of reasoning for evaluation. Growth raises real output. If it is shared, living standards rise. If it comes mainly from resource-intensive production, environmental damage may offset the gains. Your judgement should depend on:

• the source of growth, since AS-led growth tends to be non-inflationary and demand-led growth near capacity may not be;
• whether growth is per capita, since population growth can absorb output gains;
• distribution, since the benefits may be spread unevenly;
• time period, since costs such as depletion can appear after the gains;
• starting point, since a low-income economy often gains more from extra output than a high-income one.

Section 9.2 returns to inclusive and sustainable growth at A Level.

Common errors

• Using nominal GDP to measure growth. Use real GDP, or deflate first.
• Subtracting the inflation rate from nominal growth and calling it exact. Divide by the price index instead.
• Adding annual growth rates to get the total over several years.
• Confusing growth in the level of GDP with a higher level of GDP. A country can have high GDP and low growth.
• Treating a rise in GDP as automatically a rise in welfare without comment.
• Listing causes without saying how each changes AD, AS or the PPC.

Official syllabus

Cambridge International AS & A Level Economics 9708 syllabus for examination in 2026, 2027 and 2028, published by Cambridge University Press & Assessment (Cambridge International Education). Sections 4.4.1 to 4.4.5.