A-Level Economics May/June 2024 Q2(a): With the use of examples, explain the difference between public goods and merit goods a…

1 answer

• ▲0
  accepted ✓

  Public goods and merit goods are two distinct types of goods that lead to market failure, but for different reasons.

  Public goods are defined by two key characteristics: they are non-rivalrous, meaning one person's consumption does not diminish the amount available for others, and non-excludable, meaning it is impossible or prohibitively expensive to prevent non-payers from consuming the good. For example, national defence is a public good; one citizen's protection does not reduce the protection of another, and it is not possible to exclude a specific person within the country from being defended. Other examples include street lighting and flood defence systems.

  Merit goods, in contrast, are goods that are considered intrinsically beneficial for society, but which would be under-consumed if left to the free market. Unlike public goods, they are typically rivalrous and excludable. The market failure arises because consumers suffer from information failure; they do not fully perceive the private benefits of consumption (e.g., the long-term health benefits of a vaccination). Furthermore, merit goods often generate significant positive externalities, where consumption benefits third parties. Examples of merit goods include healthcare and education. An individual's education benefits not only them but also society through a more productive workforce and informed citizenry.

  Markets will not always provide enough of both goods. In a pure market economy, public goods will not be provided at all. This is due to the free-rider problem. Since the good is non-excludable, rational consumers will wait for someone else to pay for it, knowing they can benefit without contributing. This removes the profit motive for a private firm to supply them, leading to a missing market. For merit goods, the market will under-provide them relative to the socially optimal level. The market equilibrium quantity is determined where marginal private benefit (MPB) equals marginal private cost (MPC). However, due to positive externalities, the marginal social benefit (MSB) is greater than the MPB. The free market ignores these external benefits, resulting in under-production and under-consumption.

  In a mixed economy, the government intervenes to correct these failures. For public goods, this typically means direct provision, funded through general taxation, to overcome the free-rider problem. For merit goods, governments may use subsidies to lower the price and encourage consumption, provide the good directly for free or at a low cost (e.g., state schools, public healthcare), or run information campaigns to correct the information failure. However, government provision is constrained by the size of its budget and the opportunity cost of spending. There is also the risk of government failure, where intervention leads to an inefficient allocation of resources.

  In conclusion, markets will not always provide enough of both goods. A pure free market will completely fail to provide public goods and will always under-provide merit goods. A mixed economy attempts to rectify this, and can increase the quantity provided towards the socially optimal level. However, whether this provision is 'enough' is debatable. Financial constraints, political priorities, and difficulties in accurately measuring externalities mean that even with government intervention, the provision of both public and merit goods may still be suboptimal. Therefore, it is highly unlikely that markets, whether free or mixed, will always provide a sufficient quantity of both.

  ---

  How the marks are awarded

  • AO1_1 — Accurate examples of both types of goods are provided: 'national defence' and 'street lighting' for public goods, and 'healthcare and education' for merit goods.
  • AO1_2 — The characteristics of public goods are clearly and accurately explained as being 'non-rivalrous' and 'non-excludable'.
  • AO1_3 — The characteristics of merit goods are clearly explained in terms of being under-consumed due to 'information failure' and generating 'positive externalities'.
  • AO2_1 — Analysis of a market economy's failure to provide is explained: for public goods, the 'free-rider problem' removes the 'profit motive', and for merit goods, the market 'will under-provide them'.
  • AO2_3 — The analysis of market failure is developed further by explaining the free-rider problem for public goods and linking the under-provision of merit goods to positive externalities where 'MSB is greater than the MPB'.
  • AO2_2 — Analysis of a mixed economy's response is provided, including 'direct provision' for public goods and 'subsidies' or direct provision for merit goods, while also noting constraints like 'the opportunity cost of spending'.
  • AO3_1 — A valid evaluation is offered by comparing the outcomes in two market systems: 'A pure free market will completely fail to provide public goods... A mixed economy attempts to rectify this...'
  • AO3_2 — A valid and well-supported conclusion is reached, stating that markets will not always provide enough and that even government intervention in a mixed economy is not guaranteed to be perfectly successful.

  Common mistakes

  • Confusing public goods with goods provided by the public sector. For example, incorrectly stating that healthcare is a public good because it is often provided by the government; it is a merit good because it is rivalrous and excludable.
  • Failing to explain the 'why' behind market failure. For instance, stating that public goods are not provided without explaining the free-rider problem and the lack of a profit motive.
  • Defining merit goods simply as 'good for you' without linking their under-consumption to specific economic concepts like information failure and positive externalities.
  • Providing a one-sided answer that only discusses government intervention as a perfect solution, without evaluating its limitations such as opportunity cost, high costs, and the potential for government failure.

  Examiner tip: Always define key terms using their precise technical characteristics (e.g., non-rivalry/non-excludability) before analysing the resulting market failure and potential policy responses.

  ---

  AI-generated model answer, grounded in the official Cambridge mark scheme and reviewed by the MarkScheme team. Mark your own answer to this question →

  @markscheme_answers

Your answer

Sign in to answer this question.