Causes of Growth

Specification Coverage: Edexcel unit 2.5.1 - Causes of Growth. Students should be able to understand and explain the difference between actual and potential growth, distinguish between short-run and long-run growth, identify the factors that cause long-run supply-side growth, and analyse the concept of export-led growth. These notes also cover demand-side causes of growth and the use of AD/AS diagrams to illustrate it.

Actual vs. Potential Growth

Actual Growth: An increase in real GDP over time. It is measured by the percentage change in the actual output of goods and services.

Potential Growth: An increase in the economy's productive capacity. This is the maximum possible output the economy could produce if all resources were fully employed.

Short-Run Economic Growth

Cause: An increase in aggregate demand (or SRAS).

This may be triggered by a rise in any component of AD: consumption, investment, government spending, or net exports.

Result: The economy moves closer to its existing productive potential, which can be shown as moving from inside the PPF towards the frontier.

AD/AS diagram showing aggregate demand shifting right along SRAS, raising both real GDP and the price level
Figure 1: Short-Run Growth on AD/AS Diagram. An increase in aggregate demand (AD) from AD1 to AD2 leads to a higher real GDP (Y1 to Y2) and a higher price level (P1 to P2) in the short run. This represents actual growth as the economy moves closer to its productive potential, but it does not increase the long-term capacity of the economy.
Production possibility frontier showing actual growth as the economy moves from inside the curve towards the frontier
Figure 2: Short-Run Growth on PPF Diagram. The economy moves from point X, which is inside the PPF, to point Y, which is closer to the frontier. This represents actual growth as the economy utilises more of its existing resources, but the PPF itself does not shift, indicating that potential output has not increased.

Long-Run Economic Growth

Cause: An increase in the quality or quantity of the factors of production, including land, labour, capital, and enterprise.

Result: A shift outward of the LRAS curve and the production possibility frontier. This is an increase in potential output.

Long-run aggregate supply shifting right as productive capacity grows, raising potential output and easing the price level
Figure 3: Long-Run Growth on AD/AS Diagram. An outward shift in the LRAS curve from LRAS1 to LRAS2 represents an increase in the economy's productive potential. This allows for a higher level of real GDP (Y1 to Y2) without causing inflationary pressure, as the economy can produce more goods and services at the same price level (P1).
Production possibility frontier shifting outwards to show long-run growth in the economy's productive potential
Figure 4: Long-Run Growth on PPF Diagram. The production possibility frontier shifts outward from PPF1 to PPF2, indicating an increase in the economy's productive potential. The economy can now produce more of both goods without sacrificing the production of either good, which represents sustainable long-term growth.

Factors Causing Long-Run Growth

These factors shift the LRAS curve outwards.

Factor How It Increases Potential Output
Technological Advances Improve the quality of capital and make production more efficient.
Investment in Capital Increase the quantity and quality of physical capital, such as machinery and infrastructure.
Improvements in Human Capital Improve the quality of labour through better education, training, and healthcare.
Demographic Changes Increase the quantity of labour through population growth or positive net migration.
Increased Competition and Enterprise Create more efficient markets and encourage innovation.
Institutional Improvements Better legal systems, property rights, and political stability encourage investment and growth.

Export-Led Growth

Concept: A strategy where economic growth is mainly driven by a sustained increase in exports.

Mechanism: Rising exports directly increase aggregate demand in the short run. The income and investment generated can then help to improve productive capacity in the long run.

Example: China's rapid growth from the 1990s to the 2010s was strongly linked to export-led development.

Risks: Export-led growth can make an economy too dependent on global demand and more vulnerable to external shocks.

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Seven original multiple-choice questions on actual against potential growth, the factors behind long-run growth, and export-led growth.

Practice Questions: 2.5.1 Causes of Growth

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Four questions on Causes of Growth from the Edexcel A-Level papers, 2017–2023, 12 to 25 marks. Each one links straight to the page of the official mark scheme where its answer begins.

Past Paper Questions: 2.5.1 Causes of Growth