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How is economic growth measured, what causes it, and how does it move through the business cycle?

Economic growth and the business cycle: the measurement of GDP and growth, real versus nominal and per-capita measures, the causes of short-run and long-run growth, the phases of the business cycle, and the costs and benefits of growth.

An Eduqas A520 answer to economic growth, covering how GDP and growth are measured, real versus nominal and per-capita GDP, the causes of short-run (actual) and long-run (potential) growth, the four phases of the business cycle and output gaps, and the costs and benefits of economic growth.

Generated by Claude Opus 4.812 min answerUpdated 2026-06-02

Reviewed by: AI editorial process; not yet individually human-reviewed

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Quick answer

Economic growth is an increase in real Gross Domestic Product (GDP), the total value of goods and services produced in an economy in a year. Nominal GDP is measured at current prices; real GDP strips out inflation, so only real growth shows a true rise in output. GDP per capita (per head) is the best simple measure of living standards. Short-run (actual) growth is a rise in real output using existing capacity (a rightward shift of AD or SRAS), while long-run (potential) growth is a rise in the productive capacity of the economy (an outward shift of the PPF and LRAS) from more or better factors of production. The business cycle is the fluctuation of actual GDP around the trend, with four phases (boom, downturn/recession, slump/trough, recovery) and output gaps (positive when actual exceeds potential, negative when it falls short). Growth raises living standards but brings environmental and inflationary costs.

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What this dot point is asking
Measuring GDP and growth
Short-run and long-run growth
The business cycle and output gaps
Costs and benefits of growth
Examples in context
Try this

What this dot point is asking

Eduqas wants you to explain how GDP and economic growth are measured, distinguish real from nominal and total from per-capita figures, identify the causes of short-run and long-run growth, describe the phases of the business cycle and output gaps, and evaluate the costs and benefits of growth. Growth is the first of the macroeconomic objectives and the lens through which the others are judged.

Measuring GDP and growth

Because population changes, GDP per capita (GDP divided by population) is a better measure of average living standards than total GDP. Even GDP per capita has limits: it ignores the distribution of income, non-marketed output (household and voluntary work), the hidden economy, leisure and environmental quality, which is why broader well-being measures are also used.

Short-run and long-run growth

The distinction matters for policy: demand-side policy drives short-run growth by closing a negative output gap, while supply-side policy raises long-run potential.

The business cycle and output gaps

Converting nominal GDP to real GDP with a deflator

Step 1: state the data

Nominal GDP in year 2 is $\pounds 624$ billion. The GDP deflator (a price index) has risen from 100 in the base year to 120 in year 2.

Step 2: apply the real-GDP formula

Real GDP at base-year prices is nominal GDP divided by the price index, times 100:

\text{Real GDP} = \frac{\text{Nominal GDP}}{\text{deflator}} \times 100 = \frac{624}{120} \times 100 = \pounds 520 \text{ billion}.

Step 3: interpret

Although nominal GDP is $\pounds 624$ billion, once the 20 per cent rise in prices is removed, real output is worth $\pounds 520$ billion at base-year prices.

Step 4: find real growth

If real GDP in the base year was $\pounds 500$ billion, real growth is $\frac{520 - 500}{500} \times 100 = 4\%$ . This is the true rise in the volume of output, which the nominal figure alone overstates.

Costs and benefits of growth

Benefits of growth include higher average incomes and living standards, more employment, higher tax revenue to fund public services, and reduced absolute poverty. Costs include the risk of demand-pull inflation if growth outstrips capacity (a positive output gap), environmental damage and resource depletion (negative externalities), widening inequality if the gains are unevenly shared, and the fact that GDP growth is not the same as rising well-being. Sustainable growth seeks the benefits while limiting the environmental and social costs.

Examples in context

The 2008-09 recession. Two years of falling real GDP, a deep negative output gap and a slow recovery, the textbook downturn and slump.
China's catch-up growth. Rapid long-run growth from investment, urbanisation and technology, shifting its PPF out, alongside heavy pollution costs.
Real versus nominal pay. Periods when nominal wages rose but real wages fell (high inflation) show why the real measure matters for living standards.

Try this

Q1. Distinguish between actual (short-run) and potential (long-run) economic growth. [4 marks]

Cue. Actual = using existing spare capacity, a rightward AD shift or movement toward the PPF; potential = a rise in capacity, an outward PPF and LRAS shift from more or better factors.

Q2. Explain why GDP per capita is a better measure of living standards than total GDP. [4 marks]

Cue. It adjusts for population size, so it reflects average output per person; total GDP can rise simply because the population is larger.

Exam-style practice questions

Practice questions written in the style of WJEC Eduqas exam questions on this dot point, with worked answer explainers. The year tag is the paper they imitate, not the source.

Eduqas Component 2 20194 marksAn economy's nominal GDP rises from

\pounds 500

billion to

\pounds 530

billion while prices rise by 4 per cent. Calculate the approximate rate of real economic growth.

Show worked answer →

A short calculate question. Real growth is approximately nominal growth minus inflation.

Nominal growth: $\frac{530 - 500}{500} \times 100 = 6\%$ . Inflation is 4 per cent, so real growth is approximately $6\% - 4\% = 2\%$ .

For full marks, note this is an approximation; the exact figure is $\frac{1.06}{1.04} - 1 = 0.0192$ , about 1.9 per cent. Markers reward the nominal growth calculation and the subtraction of inflation to reach real growth (around 2 per cent).

Eduqas Component 3 (macro) 202112 marksEvaluate the view that economic growth is always beneficial for a country.

Show worked answer →

A levels-of-response essay. Knowledge and application: define economic growth (a rise in real GDP, an outward shift of the PPF for long-run growth) and explain the benefits: higher incomes and living standards, more employment, higher tax revenue for public services, and reduced absolute poverty. Use an AD-AS or PPF diagram.

Analysis: develop the income and employment gains.

Evaluation: weigh the costs: negative externalities and environmental damage, resource depletion, the risk of demand-pull inflation if growth outstrips capacity, widening inequality if the gains are unevenly shared, and the distinction between growth and well-being (GDP omits leisure, the environment and the distribution of income). Conclude with a supported judgement, for example that growth raises material living standards but is not always beneficial unless it is environmentally and socially sustainable.

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Sources & how we know this

Eduqas A Level Economics Specification (A520) — Eduqas (2015)