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← Economics notes
Edexcel IAL·Economics·IAL Economics

Market Failure & Externalities

13 min read

When markets misallocate resources: externalities, public goods, and merit and demerit goods.

Market failure occurs when the free market fails to allocate resources efficiently.

Externalities

An externality is a cost or benefit to a third party not involved in the transaction.

  • Negative externalities (e.g. pollution): social cost > private cost, so the market overproduces.
  • Positive externalities (e.g. education): social benefit > private benefit, so the market underproduces.
market Q social optimum
Negative externality: marginal social cost (red) lies above private cost (gold), so the market overproduces.

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