Cambridge IGCSE0455

Market failure

Economics 0455 Chapter Notes

What this chapter covers

Market failure - Definition of market failureMarket failure - Definitions of terms associated with market failureMarket failure - Causes of market failureMarket failure - Consequences of market failure
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In this chapter

  1. 1What is Market Failure?
  2. 2Externalities: Social vs Private Costs
  3. 3Public Goods and Merit Goods
  4. 4Demerit Goods & Information Failure
  5. 5Government Intervention to Correct Market Failures

1. What is Market Failure?

In an ideal world, the 'invisible hand' of the market guides resources to their most efficient use. This is called allocative efficiency, where resources are used to produce the goods and services that consumers want most, and social welfare is maximised. However, the market doesn't always get it right. Market failure occurs when the free market, operating on its own, fails to allocate resources efficiently. This results in a situation where a different allocation of resources could make at least one person better off without making anyone worse off. Essentially, it's a situation where the market's outcome is not the best outcome for society as a whole, leading to a net loss of economic welfare.

Key term

Market Failure: A situation in which the allocation of goods and services by a free market is not efficient, leading to a net loss of social welfare.

Examiner insight

Examiners look for a clear understanding that market failure is about inefficiency and a loss of social welfare, not just about firms making profits or things being expensive.

Common pitfall

Assuming that any market that isn't 'perfect' is a failure. Markets can be imperfect but still reasonably efficient; market failure refers to significant and specific cases where welfare is lost.

Worked example 14 marks

Explain the term 'market failure' and provide one example. [4]

  1. 1

    Step 1: Define market failure. Market failure is when the price mechanism and the free market lead to an inefficient allocation of scarce resources. This means social welfare is not maximised. [2 marks]

  2. 2

    Step 2: Provide a clear example. For instance, a factory might pollute a river. The market has 'failed' because it has over-produced the factory's good by not accounting for the pollution cost (a negative externality) imposed on society. [1 mark]

  3. 3

    Step 3: Explain why it's a failure. The price of the good does not reflect its true social cost, leading to over-consumption and a loss of welfare for those affected by the pollution. [1 mark]

Recap

  • Market failure occurs when the free market allocates resources inefficiently.
  • An efficient market outcome is called allocative efficiency, where social welfare is maximised.
  • Market failures result in a net loss of economic welfare for society.
  • Reasons for market failure include externalities, public goods, and information gaps.

Quick check

  1. What is meant by 'allocative efficiency'?2 marks

2. Externalities: Social vs Private Costs

Every decision to produce or consume has costs and benefits. Private costs are those paid by the producer or consumer (e.g., cost of raw materials, the price of a coffee). Private benefits are the benefits they receive (e.g., revenue from sales, enjoyment of the coffee). However, some decisions create spillover effects on third parties not involved in the transaction. These are called externalities. A negative externality is a harmful spillover cost (e.g., pollution from a factory harming local residents). A positive externality is a beneficial spillover (e.g., a beekeeper's bees pollinating a nearby apple orchard). To find the true cost or benefit to society, we must consider both the private and external parts. Social Cost = Private Cost + External Cost. Social Benefit = Private Benefit + External Benefit. Market failure occurs when decisions are based only on private costs and benefits, ignoring the externalities.

Social Cost = Private Cost + External Cost

Social Benefit = Private Benefit + External Benefit

Key term

Externality: A cost or benefit imposed on a third party who is not directly involved in an economic transaction or decision.

Examiner insight

High marks are awarded for clearly distinguishing between private, external, and social costs and explaining *why* the divergence leads to over-production or under-production.

Common pitfall

Confusing social cost with external cost. Remember, the social cost is the total cost, which *includes* the private cost.

Fun fact

The 'Tragedy of the Commons' is a classic example of negative externalities. When a resource like a pasture is open to all, each individual herdsman has an incentive to graze as many cattle as possible, leading to the pasture's destruction, even though it is in no one's long-term interest.

Worked example 16 marks

A chemical firm dumps waste into a river. Explain how this can lead to market failure. [6]

  1. 1

    Step 1: Identify the private costs. The firm considers its private costs, such as wages, raw materials, and energy, to decide how much to produce. [1 mark]

  2. 2

    Step 2: Identify the negative externality. The dumping of waste is a negative externality. It imposes an external cost on third parties, such as the local community and fishing businesses, who suffer from polluted water. [2 marks]

  3. 3

    Step 3: Define the social cost. The true cost to society (the social cost) is the firm's private cost plus this external cost of pollution. [1 mark]

  4. 4

    Step 4: Explain the market failure. Because the firm ignores the external cost, it does not pay the full social cost of its production. Its costs are artificially low, so the price of its product is too low and it over-produces the chemical. This is an inefficient allocation of resources, representing market failure. [2 marks]

Recap

  • Private costs are paid by the producer/consumer involved in a transaction.
  • External costs (negative externalities) are spillover costs imposed on third parties.
  • Social cost is the sum of private costs and external costs.
  • Markets fail when producers and consumers ignore externalities in their decisions.
  • Positive externalities are beneficial spillovers to third parties.

Quick check

  1. If a factory's private cost to produce a car is £10,000 and the pollution it creates causes £500 of damage to the environment, what is the social cost?2 marks

3. Public Goods and Merit Goods

Some goods and services are not provided by the free market, or are under-provided. This is a major form of market failure. We can distinguish between two types: Public Goods and Merit Goods. A Public Good has two key features: it is 'non-excludable' (you cannot stop someone from benefiting from it, e.g., street lighting) and 'non-rivalrous' (one person's use does not reduce the amount available for others). Because of this, private firms won't supply them; they cannot charge people, leading to the 'free-rider problem' where people benefit without paying. A Merit Good is a good that is better for a person than they realise (e.g., education, healthcare, pensions). If left to the market, people would under-consume them because they have imperfect information about the long-term benefits. Because of the large positive externalities they generate, the government often provides them or subsidises them to increase consumption.

Key term

Public Good: A good that is both non-excludable and non-rivalrous in consumption, leading to it not being provided by the free market.

Common pitfall

Confusing public goods with goods provided by the public sector. A state school is provided by the public sector, but it is a merit good, not a public good (it is rivalrous and excludable).

Worked example 14 marks

Explain why national defence is considered a public good and why it must be provided by the government. [4]

  1. 1

    Step 1: Apply the characteristics of a public good. National defence is non-excludable; it is impossible to protect some citizens from invasion while excluding others who haven't paid. [1 mark]

  2. 2

    Step 2: Apply the second characteristic. It is also non-rivalrous; one person's protection by the armed forces does not diminish the protection available to others. [1 mark]

  3. 3

    Step 3: Explain the free-rider problem. Because it is non-excludable, a private firm could not charge for this service. Individuals would wait for others to pay, hoping to 'free-ride' on the protection. [1 mark]

  4. 4

    Step 4: Conclude on government provision. As no private firm can make a profit, the market will not provide national defence. Therefore, the government must provide it and fund it through compulsory taxation. [1 mark]

Worked example 24 marks

Distinguish between a public good and a merit good. [4]

  1. 1

    Step 1: Define a public good by its characteristics. A public good is non-rivalrous and non-excludable, like flood defences. [1 mark]

  2. 2

    Step 2: Explain the consequence for public goods. This means they are not provided by the market at all due to the free-rider problem. [1 mark]

  3. 3

    Step 3: Define a merit good. A merit good is a good that is under-consumed in a free market because people underestimate its benefits, such as education. It does not have to be non-rivalrous or non-excludable. [1 mark]

  4. 4

    Step 4: Explain the consequence for merit goods. This means they are provided by the market, but in insufficient quantities. The government intervenes to increase consumption. [1 mark]

Recap

  • Public goods are non-excludable and non-rivalrous.
  • The 'free-rider problem' prevents private firms from supplying public goods.
  • Merit goods are under-consumed because people have imperfect information about their benefits.
  • Examples of public goods include national defence and street lighting.
  • Examples of merit goods include education and healthcare.

Quick check

  1. State the two defining characteristics of a pure public good.2 marks
  2. Why is healthcare considered a merit good?2 marks

4. Demerit Goods & Information Failure

Just as markets under-provide merit goods, they over-provide and over-consume demerit goods. A demerit good is a product that is considered harmful for the person who consumes it, and also has negative effects on society. The social costs of its consumption are greater than the private costs. Classic examples include cigarettes, alcohol, and gambling. The key reason for their over-consumption is often information failure. Consumers may be unaware of, or ignore, the long-term damage to their own health (the internal private cost). They also may not consider the negative externalities they create, such as the cost of healthcare for smoking-related diseases (an external cost to society) or the dangers of drunk driving. Because the market price does not reflect the full social cost, the good is too cheap and consumed in quantities that are too high from society's point of view.

Key term

Demerit Good: A good that is considered to be harmful to the individual and society, and is over-consumed and over-produced in a free market.

Fun fact

In 2018, the UK introduced a 'Sugar Tax' on soft drinks. Companies responded in two ways: some put up prices, but many others reformulated their drinks to contain less sugar to avoid the tax, a direct response to the government intervention.

Worked example 16 marks

Analyse why a government might impose a high tax on sugary drinks. [6]

  1. 1

    Step 1: Identify sugary drinks as a demerit good. Sugary drinks can be classified as a demerit good because their over-consumption leads to negative effects that consumers may not fully appreciate (information failure). [1 mark]

  2. 2

    Step 2: Explain the private and social costs. The private costs include the price of the drink and long-term health problems like obesity and diabetes. The social costs include the strain on the public healthcare system (a negative externality). [2 marks]

  3. 3

    Step 3: Explain the market failure. Because consumers may ignore the long-term health costs and the price does not include the external healthcare costs, the market leads to over-consumption. [1 mark]

  4. 4

    Step 4: Explain the effect of the tax. A tax increases the price of sugary drinks. This forces consumers and producers to 'internalise the externality'. The higher price should reduce demand, moving consumption closer to the socially optimal level. [2 marks]

Recap

  • Demerit goods are harmful to the individual and society.
  • The social costs of consuming a demerit good exceed the private costs.
  • Information failure is a key reason why demerit goods are over-consumed.
  • The market over-provides and over-consumes demerit goods, leading to market failure.
  • Governments often tax demerit goods to reduce their consumption.

Quick check

  1. Give two examples of demerit goods.1 mark
  2. What is meant by 'information failure' in the context of smoking?2 marks

5. Government Intervention to Correct Market Failures

When a market fails, a government may choose to intervene to try and correct the problem and improve the allocation of resources. There are several tools it can use, each suited to a different type of failure. 1) Taxes: By placing a tax on goods with negative externalities (like petrol or tobacco), the government increases the private cost of production/consumption, aiming to reduce the quantity to the socially optimal level. 2) Subsidies: A subsidy is a payment from the government to encourage the production or consumption of a good with positive externalities (like solar panels or vaccinations). It lowers the private cost, encouraging more output. 3) Regulation & Laws: The government can simply make things illegal (e.g., selling certain drugs) or set limits (e.g., on pollution levels for firms). This is a direct command-and-control approach. 4) Direct Provision: For public goods (like defence) and some merit goods (like state education), the government provides the service itself, funded by taxes. 5) Information Provision: To tackle information failures, governments can run awareness campaigns (e.g., on the dangers of smoking or the benefits of healthy eating).

Key term

Government Intervention: Actions taken by the government to influence market outcomes in an attempt to correct market failures and improve economic welfare.

Examiner insight

When asked to 'discuss' or 'evaluate' government intervention, strong answers will also consider the possibility of 'government failure', where the intervention itself leads to a worse outcome due to unintended consequences, high costs, or imperfect information.

Fun fact

Singapore is famous for its use of intervention to manage car usage, a source of major negative externalities like congestion and pollution. It uses a combination of high taxes, a limited quota of permits to own a car, and electronic road pricing that charges drivers more during peak hours.

Worked example 16 marks

Discuss whether government spending on police and armed forces could be a result of market failure. [6]

  1. 1

    Step 1: Identify the type of good. Police and armed forces (national defence) are classic examples of public goods. [1 mark]

  2. 2

    Step 2: Explain why they are public goods. They are non-excludable (everyone is protected) and non-rivalrous (one person's protection doesn't reduce others'). [2 marks]

  3. 3

    Step 3: Explain the market failure. Due to these characteristics, a private firm cannot charge for the service, leading to the free-rider problem. Therefore, the free market would not provide them at all. [2 marks]

  4. 4

    Step 4: Conclude the discussion. The complete absence of these essential services in a free market is a significant market failure. Therefore, government spending to provide them is a direct response to this failure. [1 mark]

Recap

  • Governments intervene to correct market failures and improve welfare.
  • Taxes are used to discourage consumption of goods with negative externalities.
  • Subsidies are used to encourage consumption of goods with positive externalities.
  • Regulation sets legal limits or bans on certain activities.
  • Governments directly provide public goods and some merit goods.
  • Information campaigns can help correct information failures.

Quick check

  1. Which type of intervention would be most suitable to tackle the 'free-rider problem' associated with street lighting?1 mark
  2. What is the purpose of a government subsidy on electric cars?2 marks

End-of-chapter exercise

Test yourself on the whole chapter. Work through these before moving on.

  1. Define 'market failure' and give two distinct reasons why it might occur.4 marks
  2. Explain, using the concepts of private cost, external cost and social cost, why a firm that pollutes is an example of market failure.6 marks
  3. Distinguish between a merit good and a demerit good, using an example of each.4 marks
  4. Why will a private company not build and operate a lighthouse?4 marks
  5. Analyse two methods a government could use to reduce the consumption of demerit goods such as tobacco.6 marks
  6. Discuss whether a subsidy is the best way for a government to encourage the use of renewable energy.8 marks
  7. Explain how 'information failure' can lead to market failure in the case of both merit and demerit goods.6 marks
  8. A country's government decides to increase its spending on education and healthcare.8 marks
  9. Evaluate the view that all negative externalities should be eliminated through government regulation.8 marks
  10. Explain why a monopoly can be considered a form of market failure.6 marks

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