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Market Failure and Government Intervention

Private, external and social costs

  • 3 things to know
  • Papers 1 and 3

Overview

Private, external and social costs and calculating social cost, the external costs of road haulage and coal power, third parties, why firms ignore external costs, marginal social cost against marginal private cost, over-production, welfare loss on a diagram, and measuring external costs in money.

What you need to know

Answer each one before you reveal it.

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Key term

How is social cost made up, and who bears the external costs of a new road, a power station and a polluting factory?

Key term

State the relationship between private cost, external cost and social cost.

Key term

A chemical plant's private costs are £8 million and the external cost of its pollution is £3 million. State the social cost.

Questions from this subtopic

Each one with the model answer underneath.

  1. 1

    Define private cost.

    Model answer

    A private cost is a cost borne by the individual or firm carrying out an activity, such as the wages and raw materials a producer pays for.

  2. 2

    Define external cost.

    Model answer

    An external cost is a cost imposed on a third party who takes no part in the transaction and receives no compensation for it.

  3. 3

    State the relationship between private cost, external cost and social cost.

    Model answer

    Social cost equals private cost plus external cost.

  4. 4

    A chemical plant's private costs are £8 million and the external cost of its pollution is £3 million. State the social cost.

    Model answer

    The social cost is £11 million.

  5. 5

    Give two external costs created by road haulage.

    Model answer

    Congestion imposed on other road users, and air pollution that damages the health of people living along the route.

  6. 6

    Who is the third party when a factory discharges waste into a river?

    Model answer

    The anglers, water companies and residents downstream, who bear the cost of the pollution without taking any part in the factory's transactions.

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