Public Goods and Market Failures

Overview

• Topic: Public goods and market failures, from a short microeconomics lecture.
• Main idea: Some goods lead to inefficient outcomes when left to private provision; public goods require government provision to avoid free riding.

Key Concepts

• Market Failure

  • Definition: When rational individual behavior leads to a worse outcome for society.
  • Examples: Externalities (pollution), imperfect competition (monopoly/oligopoly), public goods.

• Rivalry (Rival vs. Non-Rival)

  • Rival good: Consumption by one person reduces availability for others.
  • Examples: Cup of coffee, shoes, trees cut down, apartments, library books.
  • Non-rival good: One person’s consumption does not reduce availability for others.
  • Examples: Cable TV show, a discovered drug cure, fire department protection.

• Excludability (Excludable vs. Non-Excludable)

  • Excludable good: People can be prevented from using it if they don't pay.
  • Examples: Coffee, shoes, apartments, cable TV, new medicines.
  • Non-excludable good: Cannot practically prevent non-payers from using it.
  • Examples: Library books (when not enforced), public trees, fire department.

Public Goods (Non-Rival & Non-Excludable)

• Definition: Goods that are both non-rival and non-excludable.
• Consequence: Individuals have an incentive to free ride (enjoy benefits without contributing).
• Typical outcomes when private provision is expected:
  • Many people wait for others to pay.
  • The good may be underprovided or not provided at all.
• Common public goods: Fire protection, court systems.
• Policy implication: Government provision funded by taxation is generally needed to ensure these goods exist.

Matrix Summary (Rival/Non-Rival vs. Excludable/Non-Excludable)

Key Terms and Definitions

• Free Riding
  • Definition: Benefiting from a good without paying, expecting others to fund it.
• Public Good
  • Definition: A good that is non-rival and non-excludable; prone to free riding.
• Excludable
  • Definition: Property of a good where non-payers can be prevented from using it.
• Rival
  • Definition: Property of a good where one person’s use diminishes others’ use.

Action Items / Next Steps (Study Guide)

• Identify more real-world examples and classify them by rivalry and excludability.
• Practice drawing and labeling the 2x2 matrix of rival/non-rival and excludable/non-excludable.
• Consider policy responses for public goods and compare private vs. government provision.
• Review related market failures: externalities and imperfect competition, and contrast with public goods.