Cambridge O Level Economics: Supply-side policy (2281) – Revision Notes

These notes condense section 4.5 (4.5.1 to 4.5.3) of the Cambridge O Level Economics 2281 syllabus for examination in 2026. There is no tiering. For full explanations and worked examples, start with the study guide, then test yourself with the practice questions. Use the course hub, the printable checklist and the free diagnostics to find other gaps. Related unit: the mixed economic system and government intervention. All figures below are invented.

Definition (4.5.1)

Supply-side policy: government action to increase the economy’s ability to produce, by raising the productivity and efficiency of labour, capital and markets.

Demand-side (fiscal, monetary)	Supply-side
Changes spending	Changes productive capacity
Faster, but may push up prices	Slower, aims for lasting growth without price pressure
Taxes, spending, interest rates, money supply, exchange rates	Training, reforms, tax and rule changes, ownership

The six measures (4.5.2)

Measure	What the government does	Main effect	One evaluation point
Education and training	Funds schools, colleges, apprenticeships	Higher productivity, easier job switching	Slow and costly; skills may not match jobs
Labour market reforms	Weaker barriers to hiring, better job information, less union blocking	Faster matching of workers to jobs	Job insecurity; lower pay for some
Lower direct taxes	Cuts income tax and corporation tax	More reward for work, more profit to reinvest	Lost revenue; gains to the rich
Deregulation	Removes entry barriers and rules	More firms, lower prices, more efficiency	Safety and environment may suffer
Incentives to work and invest	Benefit reform, grants, investment allowances	More workers, more capital	Costs money; weak sales still deter investment
Privatisation	Sells state-owned firms	Profit motive cuts waste	Private monopoly may raise prices

Remember: direct taxes are on income and profit; indirect taxes are on spending. Privatisation changes ownership; deregulation changes rules.

Effects on macroeconomic aims (4.5.3)

Aim	Chain
Economic growth	Training, investment and competition raise productive capacity, so output can rise
Full employment	Training and reform match workers to jobs; incentives draw more people into work
Stable prices	Lower unit costs let firms hold or cut prices
Balance of payments stability	Lower costs and better quality help exports and reduce imports
Redistribution of income	Training and jobs lift low earners; but tax cuts for high earners can work the other way

Method boxes

Productivity and unit cost

1. Productivity = output ÷ number of workers.
2. Unit labour cost = total wage bill ÷ output.
3. Percentage change = (new − old) ÷ old × 100.

Reminder: 5 workers make 60 units, wage bill 1,200. Productivity 12 units each, unit labour cost 1,200 ÷ 60 = 20. After training they make 80: productivity 16 (+33.3%), unit cost 1,200 ÷ 80 = 15 (−25%).

Tax cut: reward for effort

1. Take-home = pay × (1 − tax rate).
2. Compare before and after.

Reminder: an extra 50 of pay taxed at 20% leaves 40. At 10% it leaves 45: +12.5%.

Government revenue after a tax cut

1. Revenue = taxable amount × rate.
2. Break-even amount = old revenue ÷ new rate.

Reminder: profit 200,000 at 25% gives 50,000. At 20% it gives 40,000, a loss of 10,000. Break-even profit = 50,000 ÷ 0.20 = 250,000.

Rates

Unemployment rate = unemployed ÷ labour force × 100. For 1.5 million out of 12 million: 12.5%. If it falls to 1.2 million: 10%.

Writing a chain answer

1. Name the measure and say what the government does.
2. Say who changes behaviour.
3. Say what happens to output or costs.
4. Link to the named macroeconomic aim.
5. Add one limit: time, cost, who loses, or whether other things change.

Short worked chains

Training and unemployment (a made-up region). A mining town loses its mine and 400 workers lose their jobs. They have no skills for the new factory nearby. The government funds retraining. After a year 250 of them meet the factory’s needs and take jobs. Structural unemployment falls by 250, which is 62.5% of the 400 (250 ÷ 400 × 100). The other 150 may still need more help, which is why training is slow and not complete.

Privatisation and prices. A state railway sells tickets at 40 and loses money. After sale, the new owner cuts costs and the fare falls to 34: (34 − 40) ÷ 40 × 100 = −15%. If instead the owner is the only operator, the fare could rise. The market structure after sale decides the result.

Investment incentive and growth. A government offers a tax allowance on new machines. A bakery buys one more oven and output per worker rises. Over the economy, more capital raises potential output, so growth can be faster without extra pressure on prices. If firms expect few customers, the allowance does little.

Evaluation toolkit

Add at least one of these to any “evaluate” or “discuss” answer, and tie it to the case:

• Time: training and investment take years to show results, while an election or a fall in demand may be sooner.
• Cost: money spent on grants or schools could have been spent elsewhere.
• Size of response: a tax cut helps only if people and firms respond.
• Who gains: high earners and owners may gain most, so inequality may rise.
• Side effects: weaker rules may harm workers, consumers or the environment.
• Other aims: a policy that helps growth may conflict with redistribution or the balance of payments.

A balanced answer ends with a judgement: which measure is likely to work best in this case, and why.

Must-know distinctions

• Supply-side policy raises capacity; demand-side policy changes spending.
• Potential output (what the economy can produce) is different from actual output (what it does produce).
• Education is a spending choice with an opportunity cost, so say what is given up.
• A tax cut raises the reward from work but does not guarantee more work.
• Privatisation helps efficiency most when competition exists.

Quick self-test

1. What is meant by supply-side policy?
2. List the six supply-side measures given in the syllabus.
3. Five workers make 60 units a week. After training they make 80. Calculate the percentage rise in output per worker.
4. A wage bill of 1,200 and output of 80 units: calculate unit labour cost.
5. An extra 50 of pay is taxed at 20%, then at 10%. Calculate the percentage rise in take-home extra pay.
6. A firm earns profit of 200,000 and the tax rate falls from 25% to 20%. Calculate the change in tax paid.
7. State one disadvantage of privatisation.
8. Explain how deregulation could lower prices.
9. Explain how supply-side policy could help the balance of payments.
10. In Country N (invented), potential output rises from 250 to 265 billion. Calculate the percentage growth.
11. State one way a direct tax cut could conflict with redistribution of income.
12. A job pays 170 after tax and benefit is 120. A tax cut lifts take-home pay to 185. Calculate the percentage rise in the gain from working.

Answers

1. Government action to increase the economy’s ability to produce, by raising productivity and efficiency.
2. Privatisation; deregulation; lower direct taxes; labour market reform; education and training; better incentives to work and invest.
3. Before: 60 ÷ 5 = 12. After: 80 ÷ 5 = 16. Rise = (16 − 12) ÷ 12 × 100 = 33.3%.
4. 1,200 ÷ 80 = 15.
5. 50 × 0.80 = 40; 50 × 0.90 = 45; (45 − 40) ÷ 40 × 100 = 12.5%.
6. 200,000 × 0.25 = 50,000; 200,000 × 0.20 = 40,000; tax paid falls by 10,000.
7. For example, a private monopoly may raise prices, or unprofitable but useful services may be cut.
8. Rules that limit entry are removed, more firms compete, and firms cut prices and costs to win customers.
9. Lower costs and better quality make exports more competitive and home goods more attractive than imports, so the trade balance can improve.
10. (265 − 250) ÷ 250 × 100 = 6%.
11. Cutting income tax gives bigger cash gains to high earners, so the gap between rich and poor may widen.
12. Gain before: 170 − 120 = 50. After: 185 − 120 = 65. Rise = (65 − 50) ÷ 50 × 100 = 30%.

Where marks are usually lost

• Naming a measure but not saying how it raises output or lowers costs.
• Describing higher government spending or lower interest rates as supply-side policy.
• Forgetting to link the measure to the macroeconomic aim the question names.
• Claiming that tax cuts always pay for themselves.
• Writing “privatisation” when the answer needs “deregulation”, or the reverse.
• Giving a list of advantages with no limit or judgement when asked to evaluate.
• Leaving out units or the “× 100” in percentage calculations.
• Using a real-world statistic you are unsure of, instead of reasoning from the information given.

Official syllabus

Cambridge O Level Economics 2281, syllabus for examination in 2026 (version 2), Cambridge University Press & Assessment, section 4.5.