Supply-⁠side policy | IGCSE Class 10 Economics Notes

This note covers the definition of supply-side policy, the main supply-side policy measures (education and training, labour market reforms, lower direct taxes, deregulation, improving incentives to work and invest, and privatisation), and how these measures may help a government achieve its macroeconomic aims.

What is supply-side policy?

Supply-side policy is government policy that aims to increase an economy's productive capacity by making markets, particularly the labour market, work more efficiently and by raising the quantity and quality of factors of production.

Unlike demand-side policy, which works by changing aggregate demand, supply-side policy works through aggregate supply, the total output that firms in an economy are willing and able to supply at each price level.

Definition: Supply-side policy. Government policy designed to increase the productive capacity of an economy by improving the efficiency of markets and factors of production, so that aggregate supply rises.

Supply-side measures are usually long-term in their effect. They work by shifting the long-run aggregate supply (LRAS) curve, which shows the maximum output an economy can produce when all its resources are fully and efficiently employed, to the right.

This is different from demand management, which shifts the aggregate demand curve and tends to have a quicker, shorter-run effect on output and prices.

How does education and training increase supply?

Spending on education and training raises the skill level and productivity of the workforce. A worker who has received more schooling, vocational training or on-the-job training can usually produce more output in a given time than an untrained worker, and is better able to use new technology and adapt to changing job requirements.

Governments can increase education and training through subsidised or free schooling, grants for vocational courses, and incentives for firms to train staff.

Because a more skilled workforce raises labour productivity, it increases the economy's potential output and shifts LRAS to the right.

For example, a national policy that raises spending on schooling as a share of national income, and widens access to schooling, aims to build the stock of skills (often called human capital) that supports long-run growth in productive capacity.

How do labour market reforms increase aggregate supply?

Labour market reforms are measures that make the labour market more flexible, for example by reducing the power of trade unions to restrict the supply of labour, reducing unemployment benefits so that people have a stronger incentive to take jobs, reducing a national minimum wage where it is set above the market-clearing wage, or easing laws that make it costly for firms to hire and dismiss workers.

These reforms are intended to reduce costs for firms and reduce frictional and structural unemployment, so that more of the workforce is available for production.

A more flexible labour market can respond faster to changes in demand for particular skills, which raises the economy's potential output.

Critics argue that weakening union power or lowering the minimum wage may reduce workers' bargaining power and widen income inequality, even though it may raise aggregate supply.

How do lower direct taxes act as a supply-side measure?

Direct taxes are taxes on income and profit, such as income tax and corporation tax.

Lowering direct tax rates is intended to increase the post-tax reward from working, so that people have a greater incentive to join the labour force, work longer hours or take on more responsible, better-paid jobs.

Lower corporation tax leaves firms with more after-tax profit to reinvest in new capital and in research and development.

A reduction in income tax may also reduce tax evasion and encourage voluntary disclosure of income, so that the tax actually collected does not necessarily fall.

Lower direct taxes are usually combined with other supply-side measures because, on their own, a tax cut mainly affects incentives rather than the physical capacity of the economy.

What is deregulation and how does it increase supply?

Deregulation means removing or relaxing government rules and licensing requirements that restrict competition and raise the cost of doing business.

Examples include removing the need for firms to obtain a licence before starting production, ending restrictions on which industries the private sector may enter, and removing price controls so that the market, rather than the government, determines prices.

Definition: Deregulation. The removal or reduction of government rules, licences and controls that restrict competition in a market, so that firms can enter, expand and set prices more freely.

Deregulation is intended to increase competition, which puts pressure on firms to cut costs, raise efficiency and innovate.

Removing restrictions on imports and exports, lowering tariffs and ending quantitative restrictions on trade are also forms of deregulation aimed at making domestic firms more internationally competitive, since firms exposed to foreign competition have a stronger incentive to raise productivity.

How do governments improve incentives to work and invest?

Besides tax cuts, governments can improve incentives to work by reducing the generosity or duration of unemployment and welfare benefits, so that the gap between income from work and income from benefits (often called the "benefit trap") is wider.

Incentives to invest can be improved through investment allowances, tax relief on profits that are reinvested, and subsidies for research and development.

These measures encourage firms to add to the economy's capital stock, which raises potential output. Access to credit at low cost, clear property rights, and a stable regulatory environment also encourage both domestic and foreign firms to invest.

Where supply-side measures raise returns on investment, firms are more willing to build new factories, adopt new technology and expand employment, each of which adds to aggregate supply.

What is privatisation and how does it work as a supply-side measure?

Definition: Privatisation. The transfer of ownership or management of an enterprise from the government (public sector) to private individuals or companies (the private sector).

Privatisation can take place either by selling government-owned enterprises outright to private owners, or by selling part of the government's shareholding in a public enterprise to the public, known as disinvestment.

The usual argument for privatisation is that private owners, who bear the risk of loss and keep any profit, have a stronger incentive to control costs, improve quality and respond to consumers than managers of a state-run enterprise, which can improve efficiency and lower prices.

Privatisation can also attract private and foreign capital into industries that were previously reserved for the state, adding to the economy's productive capacity.

Governments in many countries have sold state enterprises, or shares in them, since the 1980s. The money raised has often been used to meet the government's revenue needs rather than being reinvested in the enterprises concerned.

Critics argue that state assets are sometimes undervalued when sold, and that privatising a profitable state enterprise may simply transfer profit to private owners without improving efficiency.

How do supply-side policy measures affect a government's macroeconomic aims?

The usual macroeconomic aims of a government are economic growth, low unemployment, low and stable inflation, a satisfactory balance of payments, and a fairer distribution of income.

Supply-side measures may help a government achieve several of these aims at the same time, because they work by shifting the LRAS curve rather than aggregate demand.

The vertical axis shows the general price level and the horizontal axis shows real national output. The LRAS curve is drawn as close to vertical, showing the maximum output the economy can sustain.

A successful supply-side policy shifts LRAS to the right, from LRAS₁ to LRAS₂, allowing a higher level of real output to be produced at broadly the same price level, so the economy can grow without generating demand-pull inflation. The same idea can be shown as an outward shift of the economy's production possibility curve (PPC), the way IGCSE questions usually show a rise in productive capacity.

By raising potential output, supply-side policy can support economic growth without pushing up prices, because the economy's capacity to produce has increased rather than just the demand for goods and services.

Reducing structural unemployment through labour market reforms and training can contribute towards full employment. Because firms can produce more efficiently at lower cost, supply-side measures may also support price stability, since lower costs of production reduce cost-push pressure on prices.

Making domestic firms more competitive internationally, for example through deregulation of trade and investment, may improve the balance of payments by helping exports grow and reducing reliance on imports.

Supply-side policy usually works slowly: building skills through education, changing labour market institutions and allowing privatised firms to restructure all take time, so these measures may not achieve the government's macroeconomic aims quickly.

Some measures, such as cutting welfare benefits or privatising a state enterprise, may also conflict with the aim of a fairer distribution of income, even where they succeed in raising aggregate supply.

Glossary

• Supply-side policy — government policy intended to raise the productive capacity of an economy by improving the efficiency of markets and factors of production.
• Aggregate supply — the total output that firms in an economy are willing and able to supply at each price level.
• Long-run aggregate supply (LRAS) — the maximum output an economy can produce when all its resources are fully and efficiently employed.
• Education and training — spending intended to raise the skills, knowledge and productivity of the workforce.
• Labour market reforms — measures intended to make the labour market more flexible, such as reducing union power or easing hiring and dismissal rules.
• Direct tax — a tax charged on income or profit, such as income tax or corporation tax.
• Deregulation — the removal or relaxation of government rules, licences and controls that restrict competition in a market.
• Privatisation — the transfer of ownership or management of an enterprise from the public sector to the private sector.
• Disinvestment — the sale by a government of part of its shareholding in a public enterprise to the public.
• Minimum wage — the lowest hourly or weekly wage that an employer is legally allowed to pay a worker.
• Trade union — an organisation of workers that negotiates pay and conditions with employers on their behalf.
• Productivity — the output produced per unit of input, such as output per worker per hour.
• Economic growth — an increase in the real output of an economy over time.
• Full employment — a situation in which almost everyone who wants to work at the going wage rate is able to find a job.
• Balance of payments — a record of a country's transactions with the rest of the world, including trade in goods and services.

Common errors and misconceptions

• Misconception: Supply-side policy and demand-side policy are the same thing. Correct: Supply-side policy shifts the LRAS curve by raising productive capacity, while demand-side (fiscal or monetary) policy shifts the aggregate demand curve.
• Misconception: Privatisation and deregulation mean the same thing. Correct: Privatisation changes who owns or manages an enterprise, while deregulation removes rules that restrict competition; a privatised firm can still operate in a regulated market.
• Misconception: Lower direct taxes always raise the amount of tax collected. Correct: A lower tax rate is intended to improve incentives and may reduce tax evasion, but this does not guarantee that total tax revenue rises.
• Misconception: Supply-side policy works as quickly as a change in interest rates or government spending. Correct: Supply-side measures such as education, training and privatisation usually take a long time to raise productive capacity.
• Misconception: Disinvestment means the government gives away a state enterprise for free. Correct: Disinvestment is the sale of part of the government's equity in a public enterprise, usually for a price intended to raise revenue.
• Misconception: Supply-side policy can only help with inflation. Correct: Supply-side measures may support several macroeconomic aims together, including growth, employment, inflation and the balance of payments, though not always quickly or without trade-offs.
• Misconception: Reducing the minimum wage always increases employment with no downside. Correct: It may raise employment by lowering labour costs, but it can also reduce the income and bargaining power of low-paid workers.

Exam-style questions with model answers

Q1. Define 'supply-side policy'. [2 marks]

1. Supply-side policy is government policy aimed at increasing the productive capacity of an economy by improving the efficiency of markets and factors of production, for example labour and capital, rather than by changing aggregate demand.

Q2. Explain two ways in which spending on education and training can increase an economy's productive capacity. [4 marks]

1. Education and training raise the skills and knowledge of workers, which increases their productivity, meaning each worker can produce more output in a given time, raising the economy's potential output.
2. A better-trained workforce can adapt more easily to new technology and new methods of production, which allows firms to adopt more efficient processes and widens the range of goods and services the economy is able to supply, shifting long-run aggregate supply to the right.

Q3. Analyse how a reduction in direct taxes may act as a supply-side policy measure. [6 marks]

1. A cut in income tax raises the post-tax reward from working, giving people a stronger incentive to join the labour force, work longer hours, or move into higher-paid, more demanding jobs, which increases the quantity of labour supplied.
2. A cut in corporation tax leaves firms with more after-tax profit, which they can reinvest in new machinery, premises or research and development, adding to the economy's capital stock and potential output.
3. Lower tax rates may also reduce the incentive for tax evasion and encourage voluntary disclosure of income, which can support government revenue even though rates are lower.
4. However, the effect on incentives may be limited if workers or firms do not respond strongly to tax changes, so a direct tax cut alone may raise aggregate supply only modestly.

Q4. Explain two reasons why a government may use labour market reforms as a supply-side measure. [4 marks]

1. Reducing the power of trade unions to restrict labour supply, or easing restrictions on hiring and dismissing workers, lowers the cost to firms of employing labour, which encourages firms to take on more workers and produce more.
2. Reducing unemployment benefits strengthens the incentive for unemployed people to search for and accept jobs, which can reduce structural and frictional unemployment and increase the size of the active labour force.

Q5. Analyse how privatisation may increase efficiency in an economy. [6 marks]

1. Private owners bear the risk of loss and keep any profit earned, giving managers a strong financial incentive to control costs, improve product quality and respond to what consumers want, unlike a state-run enterprise where there may be less pressure to perform.
2. Privatisation, including selling part of a government's shareholding in a public enterprise (disinvestment), can bring in private and foreign capital that was previously unavailable to a state enterprise, which can be used to modernise plant and raise output.
3. Exposing a formerly state-protected enterprise to competition from other private firms can force it to raise productivity and lower prices to remain competitive.
4. However, critics point out that state assets are sometimes sold below their true value, so privatisation does not always raise efficiency enough to offset the loss of public ownership.

Q6. Discuss whether or not supply-side policy measures will always help a government achieve its macroeconomic aims. [8 marks]

1. Supply-side measures such as education and training, labour market reforms and privatisation can raise long-run aggregate supply, allowing the economy to produce more output without the price level rising as much, which supports economic growth together with low inflation.
2. Improved education and reformed labour markets can reduce structural unemployment, moving the economy closer to full employment, while deregulation of trade can make domestic firms more competitive abroad, helping the balance of payments.
3. Because these measures work through improving the efficiency of markets and the stock of skills and capital, they can in principle support several macroeconomic aims at the same time, unlike demand-side policy, which often involves a trade-off, for example between growth and inflation.
4. However, many supply-side measures take a long time to have an effect; building skills through education or restructuring a newly privatised firm cannot raise output quickly, so these measures are poorly suited to dealing with a short-term problem such as a sudden rise in unemployment.
5. Some measures may also work against other aims: cutting unemployment benefits or weakening trade unions may raise aggregate supply but can also widen income inequality, working against the aim of a fairer distribution of income.
6. Overall, supply-side policy measures may help a government move towards its macroeconomic aims over the long run, but they do not guarantee success, work with a time lag, and can create trade-offs with other aims such as equity.

Key takeaways

• Supply-side policy aims to raise an economy's productive capacity by improving the efficiency of markets and factors of production.
• Supply-side policy shifts the long-run aggregate supply curve, unlike demand-side policy, which shifts aggregate demand.
• Education and training raise labour productivity and the economy's potential output over time.
• Labour market reforms, such as reducing union power or easing hiring rules, aim to make labour markets more flexible.
• Lower direct taxes are intended to strengthen incentives to work, earn more and invest.
• Deregulation removes rules and licences that restrict competition, encouraging firms to cut costs and innovate.
• Privatisation and disinvestment transfer ownership or shares from the public sector to private owners to try to raise efficiency.
• Supply-side measures may support growth, employment, price stability and the balance of payments together, but usually only over the long run.
• Supply-side measures can conflict with the aim of a fairer distribution of income, even where they raise aggregate supply.

Test yourself

What is the main difference between supply-side policy and demand-side policy?

Supply-side policy raises the economy's productive capacity by shifting long-run aggregate supply, whereas demand-side policy changes the level of aggregate demand through fiscal or monetary policy.

Give two examples of supply-side policy measures.

Any two of: education and training, labour market reforms, lower direct taxes, deregulation, improving incentives to work and invest, or privatisation.

Why might cutting corporation tax increase an economy's productive capacity?

It leaves firms with more after-tax profit, which they may reinvest in new machinery, premises or research and development, adding to the economy's capital stock.

What is disinvestment?

The sale by a government of part of its shareholding in a public enterprise to the public, a form of privatisation.

Name one limitation of using labour market reforms such as cutting the minimum wage.

It may raise employment by lowering labour costs, but it can reduce the income and bargaining power of low-paid workers, worsening income distribution.

How can supply-side policy help a government achieve the aim of low inflation alongside growth?

By shifting long-run aggregate supply to the right, the economy can produce more output at broadly the same price level, allowing growth without strong demand-pull inflation.

Why is supply-side policy usually described as a long-term approach?

Measures such as education, training and restructuring privatised firms take years to raise skills, capital and efficiency, so their effect on productive capacity appears only slowly.