Addressing the Non-Provision of Public Goods (Cambridge International A-Level Economics)

Public goods versus private goods

• Private goods are goods provided by firms for profit

  • They are excludable

    • consumers can be prevented from purchasing if they cannot pay

  • They are rival

    • consumption by one person reduces availability for others

• In contrast, public goods are:

  • Non-excludable

    • it is not possible to prevent individuals from accessing the good once it is provided

  • Non-rivalrous

    • one person’s consumption does not reduce the amount available to others

• Examples of public goods include:

  • Street lighting
  • National defence
  • Lighthouses

Light provided is non-excludeable

Why public goods are not provided by private firms

Why are public goods not provided by private firms?

• Public goods are not provided through the price mechanism due to their characteristics

1. Non-excludability = inability to charge

• Because public goods are non-excludable, firms cannot restrict access only to those who pay
• This means consumers can benefit from the good without purchasing it
• As a result, firms are unable to generate sufficient revenue

2. The free rider problem

• The free rider problem occurs when individuals:

  • Are aware that they can consume a good without paying for it
  • Therefore choose not to pay, even if they value the good

• This creates a situation where:

  • Consumers rely on others to pay
  • They still receive the benefit regardless

• Over time:

  • Fewer consumers are willing to pay
  • Any initial payments fall
  • Firms cannot cover costs

• As a result:

  • Firms will stop providing the good altogether

Result: missing market and market failure

• Since firms cannot profit, public goods are:

  • Under-provided or not provided at all

• This leads to a missing market, where:

  • A good that is beneficial to society is not produced

• This is a form of market failure because:

  • The market mechanism fails to allocate resources efficiently

Allocative inefficiency

• Public goods provide significant social benefits

• However, because they are not provided:

  • Social benefit exceeds private benefit

• This results in:

  • Under-provision relative to the socially optimal level

Why government intervention is necessary

• Governments intervene because:

  • The private sector cannot provide public goods efficiently

• Governments can:

  • Fund provision through taxation
  • Provide the good directly

• This ensures:

  • Public goods are available to all consumers
  • Provision is closer to the socially optimal level

• Therefore, government intervention:

  • Corrects the market failure caused by non-provision

• However, government provision may still be inefficient due to government failure, such as misallocation of resources or high costs

Exam Hint To secure higher marks, always show the full chain:

Non-excludability → free rider problem → no revenue → no supply → missing market → market failure → government intervention