Mixed economic system | IGCSE Class 10 Economics Notes

This note covers the mixed economic system: its definition, why markets fail and need government intervention, how maximum and minimum prices work in product, labour and foreign exchange markets, how indirect taxation and subsidies change market outcomes, other microeconomic measures (regulation, privatisation, nationalisation and direct provision), and how far government intervention actually overcomes the weaknesses of a market economy.

What is a mixed economic system?

A mixed economy is an economic system in which resources are allocated partly through the price mechanism of free markets and partly through government decision-making.

In a pure market economy, the questions of what to produce, how to produce and for whom to produce are answered entirely by the forces of demand and supply, with no state intervention.

In a pure planned (command) economy, these questions are answered entirely by the government or a central planning authority.

Almost no real economy sits at either extreme: most economies combine private ownership and free markets for many goods and services with government ownership, regulation, taxation and spending in other areas.

The balance between the private sector and the public sector differs from country to country and can change over time, but the common feature of a mixed economy is that both the market mechanism and government intervention play a part in deciding resource allocation.

The main reason governments intervene in a market economy is to try to correct market failure: situations in which the free market, left alone, fails to allocate resources efficiently from the point of view of society as a whole.

A mixed economy aims to keep the efficiency and choice that markets can provide while using government action to deal with the problems that unregulated markets create.

Definition: mixed economy. An economic system in which resources are allocated through a combination of the market mechanism (private decision-making, driven by price signals) and government intervention (planning, regulation, taxation and public ownership).

Why does market failure require government intervention?

Market failure occurs when the free market mechanism, operating through demand and supply, leads to an allocation of resources that does not maximise the welfare of society.

Common causes of market failure include externalities (costs or benefits of production or consumption that fall on third parties who are not part of the transaction, such as pollution from a factory), the under-provision of public goods (goods such as street lighting or national defence that are non-excludable and non-rival, so the free market tends not to supply them at all), the under-consumption of merit goods (goods such as education and healthcare that are under-valued by consumers and so under-consumed if left to the market) and the over-consumption of demerit goods (goods such as tobacco that are over-valued by consumers and so over-consumed if left to the market).

Market failure can also arise from monopoly power, which can lead to higher prices and lower output than in a competitive market, and from information failure, where buyers or sellers do not have full information to make rational decisions.

Because the free market, on its own, does not take account of these problems, governments use a range of microeconomic policy measures to intervene directly in particular markets.

The syllabus focuses on three main tools, maximum and minimum prices, indirect taxation and subsidies, together with wider measures such as regulation, privatisation, nationalisation and the direct provision of goods and services.

How do maximum and minimum prices work in product markets?

A maximum price (also called a price ceiling) is a legal upper limit set by the government on the price that can be charged for a good or service.

It is set below the free market equilibrium price and is intended to make an essential good more affordable to consumers, for example a maximum price on a basic foodstuff.

Because the maximum price is below equilibrium, quantity demanded at that price exceeds quantity supplied, creating excess demand (a shortage).

Firms have less incentive to supply at the lower, controlled price, so output may fall, and the shortage can lead to queuing, rationing by the seller, or the emergence of an illegal black market in which the good is resold above the legal maximum.

A minimum price (also called a price floor) is a legal lower limit set above the free market equilibrium price, intended to guarantee producers a higher price than the market would otherwise give them, for example a minimum price for an agricultural product.

Because the minimum price is above equilibrium, quantity supplied exceeds quantity demanded, creating excess supply (a surplus).

The government, or the market itself, must then decide what to do with the unsold surplus; a government may buy up and store the surplus, which has a cost to the public budget.

On a demand and supply diagram, price is on the vertical axis and quantity on the horizontal axis.

The downward-sloping demand curve and upward-sloping supply curve cross at the free market equilibrium price and quantity. A horizontal line is drawn below this equilibrium price to show the maximum price.

At that lower price, the quantity consumers wish to buy (read off the demand curve) is greater than the quantity producers wish to sell (read off the supply curve); the horizontal gap between the two curves at the maximum price line is the shortage (excess demand).

On the same type of demand and supply diagram, a horizontal line is drawn above the free market equilibrium price to show the minimum price.

At that higher price, the quantity producers wish to sell is greater than the quantity consumers wish to buy; the horizontal gap between the two curves at the minimum price line is the surplus (excess supply).

How do maximum and minimum prices work in the labour market?

In the labour market, the "price" of labour is the wage rate, and the quantity is the quantity of labour employed.

A minimum wage is a form of minimum price applied to labour: the government sets a legal lower limit on the hourly or weekly wage that employers must pay, above the free market equilibrium wage, with the aim of protecting low-paid workers and raising their living standards.

Because the minimum wage is set above equilibrium, the quantity of labour that workers wish to supply at that wage exceeds the quantity of labour that firms wish to demand, creating an excess supply of labour, which appears in the economy as unemployment among the workers affected.

A maximum wage is far less common than a minimum wage, but the same logic applies in reverse: a legal upper limit set below the equilibrium wage, intended to control the cost of highly paid roles, would create excess demand for that labour, that is, firms wanting to hire more workers at that wage than are willing to work at it.

How are maximum and minimum prices used in foreign exchange markets?

In the foreign exchange market, the "price" is the exchange rate, the price of one currency in terms of another, and the quantity is the quantity of the currency bought and sold.

A government, through its central bank, can set a minimum exchange rate (preventing the currency from falling below a chosen value) or a maximum exchange rate (preventing the currency from rising above a chosen value) instead of allowing the rate to float freely according to demand and supply for the currency.

If a minimum exchange rate is set above the free market equilibrium rate, there will be excess supply of the currency on the foreign exchange market; the central bank must then use its reserves of foreign currency to buy up the surplus of its own currency to support the price.

If a maximum exchange rate is set below the free market equilibrium rate, there will be excess demand for the currency; the central bank must sell its own currency from reserves (and buy foreign currency) to prevent the rate rising.

In the minimum exchange rate case, the central bank's holdings of foreign exchange reserves are used up in defending the controlled rate, and this can only be sustained while reserves last; in the maximum exchange rate case, the central bank instead accumulates foreign exchange reserves as it sells its own currency to prevent the rate rising.

How does indirect taxation address market failure?

An indirect tax is a tax on spending, collected by sellers on behalf of the government and added to the price of a good or service, as opposed to a direct tax, which is a tax on income or profit paid directly to the government by the taxpayer.

Indirect taxes take two main forms: a specific tax is a fixed amount of tax per unit of the good sold (for example, a tax of a set amount per litre), so the supply curve shifts upward (vertically) by the same amount at every quantity; an ad valorem tax is a percentage of the price of the good, so the supply curve shifts upward by a greater absolute amount at higher prices, making the new supply curve steeper (less parallel) than the original.

Governments use indirect taxation on demerit goods, such as tobacco and alcohol, and on goods that generate negative externalities, such as fuels that cause pollution, to raise the market price, reduce the quantity consumed towards the socially optimal level, and raise government revenue.

The incidence of a tax (who actually bears the burden of the tax, the consumer through a higher price or the producer through a lower after-tax price received) depends on the relative price elasticity of demand and supply: the less elastic side of the market bears more of the burden.

On a demand and supply diagram, the original supply curve shifts upward and to the left (reflecting the tax added to producers' costs) to a new supply curve.

The new equilibrium has a higher price and a lower quantity than before. The vertical distance between the old and new supply curves at the new equilibrium quantity shows the amount of tax per unit; the area of this tax split between the rise in price paid by consumers and the fall in the amount received by producers shows the division of the tax burden.

How do subsidies address market failure?

A subsidy is a payment made by the government to producers, which lowers their costs of production, intended to increase the supply and lower the market price of a good.

Subsidies are commonly given for merit goods, such as education, healthcare and public transport, and for goods that generate positive externalities, such as vaccinations or renewable energy, in order to increase consumption towards the socially optimal level.

A subsidy shifts the supply curve downward and to the right, leading to a new equilibrium with a lower price and a higher quantity traded than before.

Subsidies have a cost to the government budget, which must be paid for out of taxation or borrowing, and they can also be criticised for keeping inefficient producers in business if they are not carefully targeted or withdrawn once their aim has been achieved.

On a demand and supply diagram, the original supply curve shifts downward and to the right (reflecting lower costs to the producer after the subsidy) to a new supply curve.

The new equilibrium has a lower price and a higher quantity than before. The vertical distance between the old and new supply curves at the new equilibrium quantity shows the amount of subsidy per unit.

What other microeconomic policy measures do governments use?

Regulation

Regulation means the use of rules, laws and standards, set and enforced by the government or a regulatory body, to control the behaviour of firms or individuals in a market, rather than relying on price changes.

Examples include safety standards for products, limits on pollution emissions, competition law to prevent monopolies abusing their market power, and licensing requirements before a firm can operate in a market.

Regulation can correct market failure directly, for example by banning a harmful activity outright, but it carries administrative and enforcement costs, and firms may find ways to avoid or evade the rules.

Privatisation and nationalisation

Privatisation is the transfer of ownership of an asset, firm or industry from the public sector (government) to the private sector.

Nationalisation is the opposite: the transfer of ownership from the private sector to the public sector, so that an industry comes under government control.

Privatisation is argued to increase efficiency by exposing a firm to the profit motive and competitive pressure, and it raises revenue for the government from the sale of assets.

Nationalisation is used where an industry is considered a natural monopoly or of strategic national importance, where the government wants to guarantee universal provision of a service (such as a national postal or rail service) regardless of whether every part of it is profitable, or where it wishes to coordinate a whole industry in the national interest.

Direct provision of goods and services

Rather than intervening in a private market through prices, taxes, subsidies or regulation, a government may choose direct provision: producing and supplying a good or service itself, free or at a subsidised price, financed out of general taxation.

This is the usual method of supplying public goods, which the free market would not supply at all, and is also common for merit goods such as state education and state healthcare, where the government wants to guarantee a minimum standard of provision to everyone regardless of their ability to pay.

Advantages of government intervention in a market economy

1. Correcting externalities: taxes on goods with negative externalities and subsidies for goods with positive externalities can move output closer to the socially optimal level.
2. Protecting vulnerable groups: minimum wages and minimum prices can raise the incomes of low-paid workers and small producers; maximum prices can protect poor consumers from unaffordable essential goods.
3. Ensuring provision of public goods and merit goods: direct provision and subsidy guarantee that goods the free market would under-supply, such as defence, street lighting, education and healthcare, are actually available to everyone.
4. Controlling monopoly power: regulation and competition policy can prevent a dominant firm from charging excessive prices or restricting output.
5. Raising government revenue: indirect taxes and the sale of assets through privatisation provide funds that can be used for public spending elsewhere.

Limitations of government intervention in a market economy

1. Price controls that are set away from the equilibrium price create shortages (maximum prices) or surpluses (minimum prices), and can lead to black markets, rationing or the costly storage of unsold surplus.
2. Unemployment can result from a minimum wage set above the market-clearing wage for low-skilled workers.
3. Subsidies and direct provision have an opportunity cost: the government funds used must come from taxation, borrowing or reduced spending elsewhere, and subsidies can keep inefficient firms in business.
4. Regulation adds administrative and compliance costs for firms and the government, and firms may try to evade the rules.
5. Government intervention requires accurate information (for example, about the true size of an externality or the correct level for a minimum wage), and getting this wrong can make the situation worse rather than better; this risk of poorly designed intervention doing more harm than the market failure it was meant to correct is sometimes called government failure.

How effective is government intervention in overcoming the drawbacks of a market economy?

Whether government intervention is judged effective depends on weighing its intended benefits against its costs and unintended side effects in each market.

A maximum price that successfully makes a basic food affordable for poor households may, at the same time, create a shortage that leaves some consumers unable to buy the good at all, or push trade into an illegal black market where prices are even higher and the product is less safely regulated.

A minimum wage that raises the incomes of workers who keep their jobs may, at the same time, reduce the number of jobs available for the least skilled workers, so the policy helps some people and harms others.

Indirect taxes on goods such as tobacco can reduce consumption and raise revenue, but because demand for such goods tends to be relatively price inelastic, a large part of the tax burden falls on the consumer, and the tax can be regressive, taking a larger proportion of income from poorer consumers than richer ones.

Subsidies can increase consumption of merit goods and support positive externalities, but they must be paid for, and if not properly targeted or withdrawn when no longer needed, they can be an inefficient and costly way of achieving the government's aim.

Overall, a mixed economy accepts that neither a wholly free market nor a wholly planned system works well in practice, and tries instead to use the particular intervention, whether a price control, a tax, a subsidy, regulation, a change of ownership or direct provision, that best fits the specific market failure being addressed, while recognising that each intervention has costs as well as benefits, and that intervention which is badly designed or badly targeted can itself make the allocation of resources less efficient.

Going beyond the syllabus

Economies are often described as sitting along a spectrum from a pure market economy at one extreme to a pure command economy at the other, with most real economies, described as mixed economies, positioned somewhere between the two.

Over time, a government can choose to move along this spectrum, for example by privatising previously state-owned industries to move closer to the market end, or by nationalising industries and increasing regulation to move closer to the planned end; the balance chosen reflects a country's political choices as much as pure economic efficiency.

Glossary

• Mixed economy — an economic system combining the market mechanism and government intervention to allocate resources.
• Market failure — a situation where the free market fails to allocate resources efficiently for society as a whole.
• Externality — a cost or benefit of an economic transaction that falls on a third party not involved in the transaction.
• Public good — a good that is non-excludable and non-rival, which the free market tends not to supply.
• Merit good — a good that is under-consumed if left to the free market because consumers undervalue its benefits.
• Demerit good — a good that is over-consumed if left to the free market because consumers undervalue its harms.
• Maximum price — a legal upper limit on price, set below the free market equilibrium, which can cause a shortage.
• Minimum price — a legal lower limit on price, set above the free market equilibrium, which can cause a surplus.
• Minimum wage — a legal lower limit on the wage rate, which can cause unemployment if set above equilibrium.
• Indirect tax — a tax on spending, added to the price of a good and collected by the seller on behalf of the government.
• Ad valorem tax — an indirect tax charged as a percentage of the price of a good.
• Subsidy — a payment from government to producers that lowers their costs and increases supply.
• Regulation — rules and standards set by government or a regulatory body to control firms' or individuals' behaviour.
• Privatisation — the transfer of ownership of an asset or industry from the public sector to the private sector.
• Nationalisation — the transfer of ownership of an asset or industry from the private sector to the public sector.

Common errors and misconceptions

• Misconception: a maximum price is set above the equilibrium price to let sellers charge more. Correct: a maximum price is set below equilibrium, to limit how much sellers can charge.
• Misconception: a minimum price always benefits consumers. Correct: a minimum price is set above equilibrium to benefit producers or workers, and tends to raise the price paid by consumers while creating a surplus.
• Misconception: an indirect tax is always paid entirely by the seller. Correct: the incidence of an indirect tax is shared between buyer and seller, depending on the price elasticity of demand and supply.
• Misconception: a subsidy and a minimum price have the same effect on the market. Correct: a subsidy shifts the supply curve and lowers the market price; a minimum price is a legal floor that stops the price falling, and tends to raise it.
• Misconception: privatisation and nationalisation are simply opposite labels for the same policy. Correct: they move ownership in opposite directions between the private and public sectors, for different reasons.
• Misconception: government intervention always corrects market failure with no drawbacks. Correct: every form of intervention has possible costs or unintended effects, such as shortages, surpluses, unemployment or a burden on the public budget.
• Misconception: direct provision is the same as a subsidy. Correct: direct provision means the government itself produces and supplies the good; a subsidy instead lowers the cost of private producers who still supply it.

Exam-style questions with model answers

Q1. Define 'mixed economy'. [2 marks]

1. An economic system in which resources are allocated partly through the free market mechanism and partly through government intervention, such as regulation, taxation and public ownership.

Q2. Identify two microeconomic policy measures a government could use to reduce the consumption of a demerit good. [2 marks]

1. Imposing an indirect tax (specific or ad valorem) on the good to raise its price.
2. Introducing regulation, such as a ban or restriction, to limit its sale or use.

Q3. Explain two reasons why a government might set a maximum price on a basic food product. [4 marks]

1. To make an essential good affordable for low-income consumers, since without a maximum price its market price might rise above what poorer households can pay.
2. To protect consumers from price rises during a shortage, for example after a poor harvest, when the free market price would otherwise increase sharply.

Q4. Explain two drawbacks of setting a minimum wage above the equilibrium wage rate in a labour market. [4 marks]

1. It can create unemployment, because at a wage above equilibrium the quantity of labour workers wish to supply exceeds the quantity firms wish to demand.
2. It can raise firms' costs of production, which may be passed on to consumers as higher prices or may reduce the number of workers a firm can afford to employ.
3. Both drawbacks arise because the minimum wage, like any price floor, disturbs the free market equilibrium between the quantity of labour supplied and demanded.

Q5. Analyse how an indirect tax and a subsidy have opposite effects on the market for a good. [6 marks]

1. An indirect tax is a payment added to the price of a good, which raises the producer's costs at every level of output.
2. This causes the supply curve to shift upward and to the left, as sellers need a higher price to be willing to supply the same quantity.
3. The new equilibrium has a higher price and a lower quantity than before the tax, reducing consumption of the good.
4. A subsidy is a payment from government to producers, which lowers the producer's costs at every level of output.
5. This causes the supply curve to shift downward and to the right, as sellers are willing to supply the same quantity at a lower price.
6. The new equilibrium has a lower price and a higher quantity than before the subsidy, increasing consumption of the good, so the two measures move price and quantity in opposite directions.

Q6. Discuss whether or not privatisation is likely to improve the efficiency of a formerly state-owned industry. [6 marks]

1. Privatisation may improve efficiency because a privately owned firm is exposed to the profit motive, giving managers a stronger incentive to cut costs and improve productivity.
2. If privatisation is accompanied by increased competition in the industry, firms also face competitive pressure to keep prices low and quality high, which can benefit consumers.
3. Privatisation also raises revenue for the government from the sale of the industry's assets, which can be used for other public spending.
4. However, if the industry is a natural monopoly, privatising it without effective regulation may simply replace a government monopoly with a private monopoly that can still restrict output and raise prices.
5. Some services provided by state industries, such as universal postal delivery to remote areas, may not be run by a private firm if they are unprofitable, so privatisation can reduce the guarantee of universal provision.
6. Overall, whether privatisation improves efficiency depends on whether genuine competition and regulation accompany the change of ownership, rather than on the change of ownership alone.

Q7. Analyse the effectiveness of using regulation, rather than a tax, to reduce pollution from a factory. [6 marks]

1. Regulation sets a legally enforced limit on the amount of pollution a factory is allowed to emit, directly controlling the harmful activity rather than relying on a price signal.
2. This can be more certain in its effect than a tax, because the legal limit fixes the maximum quantity of pollution, whereas a tax only raises the cost of polluting and firms may still choose to pollute if they are willing to pay.
3. However, regulation requires the government or a regulatory body to monitor and enforce compliance, which has an administrative cost, and some firms may try to evade the rules if enforcement is weak.
4. A tax, by comparison, can also raise revenue for the government, which regulation on its own does not, and may give firms a continuing incentive to reduce pollution further to save on the tax.
5. Regulation may be preferred when the harm from pollution is severe and a guaranteed limit is needed, while a tax may be preferred when some pollution is acceptable but should be priced to reflect its external cost.
6. The effectiveness of either measure depends on how well it is enforced and on how accurately the limit or tax rate reflects the true scale of the external cost.

Key takeaways

• A mixed economy combines the market mechanism and government intervention to allocate resources.
• Governments intervene to correct market failure, including externalities, public goods, merit and demerit goods, and monopoly power.
• A maximum price is set below equilibrium and can cause a shortage; a minimum price is set above equilibrium and can cause a surplus.
• A minimum wage is a minimum price in the labour market and can cause unemployment if set above equilibrium.
• Indirect taxes raise price and lower quantity traded; subsidies lower price and raise quantity traded.
• Regulation controls behaviour directly through rules, rather than through price changes.
• Privatisation moves ownership from public to private; nationalisation moves ownership from private to public.
• Direct provision guarantees public goods and merit goods are supplied regardless of ability to pay.
• Every form of government intervention has possible costs or side effects, so its effectiveness must be judged case by case.

Test yourself

What is the difference between a maximum price and a minimum price?

A maximum price is a legal upper limit set below equilibrium, which can cause a shortage; a minimum price is a legal lower limit set above equilibrium, which can cause a surplus.

Why might a minimum wage lead to unemployment?

Because it is set above the equilibrium wage, the quantity of labour workers wish to supply exceeds the quantity firms wish to demand, leaving some workers without jobs.

What is the difference between a specific tax and an ad valorem tax?

A specific tax is a fixed amount per unit of the good, shifting supply up by the same amount at every quantity; an ad valorem tax is a percentage of price, shifting supply up by more at higher prices.

How does a subsidy affect the supply curve?

A subsidy lowers producers' costs, shifting the supply curve downward and to the right, leading to a lower price and higher quantity traded.

What is the difference between privatisation and nationalisation?

Privatisation transfers ownership from the public sector to the private sector; nationalisation transfers ownership from the private sector to the public sector.

Why might a government use direct provision instead of a subsidy?

Direct provision guarantees that a public good or merit good is actually supplied to everyone, rather than relying on private producers to respond to a subsidy.

What is one possible drawback of setting a maximum price?

It can create a shortage, since quantity demanded exceeds quantity supplied at the controlled price, which may lead to queuing or a black market.