Economic Growth
Edexcel International A-Level Economics· 2.3.5· 20 min read
1. Actual vs Potential Economic Growth: Causes★★☆☆☆⏱ 5 min
Actual Economic Growth
The annual percentage increase in real GDP of an economy, representing an increase in the volume of goods and services produced.
Potential Economic Growth
The annual percentage increase in the maximum sustainable output an economy can produce using all factors of production at normal capacity, representing a shift in long-run productive capacity.
Actual growth arises from increases in any component of aggregate demand (C, I, G, X-M) or short-run aggregate supply, leading to an expansion of output towards the PPF frontier. Export-led growth is a common source of actual growth, driven by rising global demand for domestic goods and services. Potential growth is driven by supply-side factors including domestic and foreign direct investment (FDI), technological innovation, growth of the labour force (including net inward migration), increased market competition, and improvements in labour productivity.
Using a PPF diagram, distinguish between actual and potential economic growth for an economy producing consumer goods and capital goods.
- 1
Draw a PPF with consumer goods on the y-axis and capital goods on the x-axis, labelled PPF1. Mark point A inside PPF1 to represent underutilisation of resources during a recession.
- 2
Actual growth is shown by a movement from point A to point B on PPF1, as unused resources are employed to increase output.
- 3
Potential growth is shown by an outward shift of the entire PPF from PPF1 to PPF2, representing an increase in the maximum possible output of both goods.
Exam tip:
When asked to distinguish between actual and potential growth, always link your answer to either the PPF or AD/AS model to earn full KAA marks.
2. Benefits and Costs of Economic Growth★★★☆☆⏱ 6 min
Economic growth is a core macroeconomic objective for most governments, but it carries both advantages and disadvantages for different groups in the economy.
Benefits of growth: Higher average living standards as real GDP per capita rises, lower cyclical unemployment as output expands, higher business profits that incentivise further investment, increased tax revenue for governments to fund public services like healthcare and education, and reduced poverty for low-income households.
Costs of growth: Opportunity cost of current consumption if growth is driven by higher capital investment, negative environmental externalities including higher carbon emissions and resource depletion, potential balance of trade deficits if rising consumer income leads to higher import spending, rising inequality if gains from growth are concentrated among high-income groups, and demand-pull inflation if actual growth outpaces potential growth capacity.
Analyse one benefit and one cost of 3% annual economic growth for a small open emerging economy.
- 1
Benefit: Lower unemployment. 3% annual growth means rising aggregate demand, so firms increase output and hire more workers, reducing cyclical unemployment and increasing household disposable income for low-income groups.
- 2
Cost: Environmental damage. Higher output is likely to be accompanied by higher industrial carbon emissions and increased exploitation of natural resources, leading to poorer air quality and negative health outcomes for local communities, especially if environmental regulations are weak.
Exam tip:
For evaluate or discuss questions on growth, always weigh costs against benefits and include a 'it depends' point, e.g. the magnitude of environmental costs depends on whether the economy uses green technology to produce output.
3. Output Gaps: Identification and Characteristics★★★☆☆⏱ 5 min
Output Gap
The difference between the actual level of real GDP in an economy and the long-run trend (potential) level of real GDP, measured as a percentage of potential GDP.
A positive output gap occurs when actual GDP is above trend potential GDP, meaning the economy is operating above full capacity, with low unemployment and upward pressure on inflation. A negative output gap occurs when actual GDP is below trend potential GDP, meaning the economy has unused spare capacity, with high cyclical unemployment and low inflationary pressure.
There are significant measurement difficulties for output gaps: potential GDP is an estimated value, not directly observed, so estimates can vary significantly between forecasters; changes in the size of the hidden economy also make actual GDP measurements inaccurate, leading to unreliable output gap calculations.
Using an AD/AS diagram, show a positive output gap for an economy operating at full employment.
- 1
Draw an AD/AS diagram with the price level on the y-axis and real GDP on the x-axis. Label the vertical LRAS curve at Yf, the full employment potential output level.
- 2
Draw an SRAS curve intersecting LRAS at the long-run equilibrium point A, with AD1 at this intersection.
- 3
Shift AD right to AD2, intersecting SRAS at point B, with output Y1 above Yf. The difference between Y1 and Yf is the positive output gap, and the price level has risen from P1 to P2, showing demand-pull inflation.
Exam tip:
For questions asking to explain measurement difficulties of output gaps, you can earn 2 marks per valid point with a brief explanation, e.g. 'potential output is unobserved, so estimates rely on assumptions about productivity growth that may be incorrect'.
4. Exam Technique for Growth Questions★★★★☆⏱ 4 min
Which of the following is a cause of potential economic growth?
A rise in consumer spending
A rise in net inward migration
A fall in income tax
A rise in government infrastructure spending
Reveal answer
A rise in net inward migration —Net inward migration increases the size of the labour force, raising long-run aggregate supply and potential growth. The other options are causes of actual growth, as they increase aggregate demand.
5. Common Pitfalls
Wrong move:
Confusing actual and potential growth by stating a rise in consumer spending causes potential growth
Why:
Consumer spending is a component of AD, so it only increases actual output, not the long-run productive capacity of the economy
Correct move:
Link actual growth to AD/SRAS changes, and potential growth to LRAS/PPF outward shifts
Wrong move:
Forgetting to reference diagrams in written analysis after drawing them
Why:
2 out of 4 marks for diagram questions are awarded for using the diagram in your explanation, not just drawing it correctly
Correct move:
Explicitly refer to shifts, points or curves in your answer, e.g. 'As shown in the diagram, the outward shift of LRAS from LRAS1 to LRAS2 shows an increase in potential output'
Wrong move:
Including Unit 4 development economics content like HDI when discussing benefits of growth
Why:
Development economics is out of scope for Unit 2, so you will not earn marks for Unit 4 content in a Unit 2 exam
Correct move:
Focus only on Unit 2 benefits: living standards, unemployment, tax revenue, profits, investment
Wrong move:
Stating that a positive output gap is always desirable
Why:
A positive output gap leads to demand-pull inflation and unsustainable overuse of factors of production, so it is often followed by an economic downturn
Correct move:
Recognise that both positive and negative output gaps represent economic instability, with associated costs
Wrong move:
Listing costs/benefits without chain reasoning in analyse questions
Why:
Analyse questions require logical chains, not just point-listing, to earn top KAA marks
Correct move:
For every point, add at least two linked stages, e.g. 'Higher growth leads to higher tax revenue, which governments can use to increase spending on public healthcare, leading to better health outcomes for low-income households'
6. Quick Reference Cheatsheet
Concept | Diagram Representation | Key Cause | Key Effect |
|---|---|---|---|
Actual Growth | Movement from inside PPF to frontier, AD/SRAS right shift | Rise in C, I, G or net exports | Lower cyclical unemployment, possible demand-pull inflation |
Potential Growth | Outward PPF shift, LRAS right shift | Higher productivity, FDI, innovation, labour force growth | Higher maximum sustainable output, lower long-run inflationary pressure |
Positive Output Gap | Actual GDP above business cycle trend, AD intersects SRAS right of LRAS | AD rising faster than potential output | Low unemployment, high inflation |
Negative Output Gap | Actual GDP below business cycle trend, AD intersects SRAS left of LRAS | Fall in AD, recession | High cyclical unemployment, low inflation |
7. Frequently Asked
What is the difference between actual and potential economic growth?
Actual growth is the measured annual percentage rise in real GDP, caused by increases in aggregate demand or short-run aggregate supply, and shown as a movement from inside to the PPF frontier. Potential growth is the rise in an economy’s maximum sustainable output capacity, caused by supply-side improvements, and shown as an outward shift of the PPF or LRAS curve.
How do I earn full marks for growth diagram questions?
- Label all axes clearly, 2) Name every curve (e.g. LRAS, AD1, AD2) and mark shift arrows, 3) Explicitly reference the diagram in your written analysis to earn the 2 explanation marks alongside the 2 diagram drawing marks.
Going deeper
What's Next
Now that you have mastered the core concepts of economic growth for Edexcel IAL Economics Unit 2, you can move on to learning about government policies designed to promote growth, the next sub-topic in the macroeconomic performance and policy unit. You should also practice applying growth analysis to past paper questions, focusing on building logical chain reasoning for 6, 8 and 14-mark questions, and making sure you correctly draw and reference all required diagrams in your answers. Remember that Unit 2 evaluation is weighted at 20%, so you should always include balanced judgements when answering evaluate or discuss questions about the costs and benefits of growth.