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Revenue, Costs, Profits and Cash

Profit as an incentive: market entry and exit

  • 3 things to know
  • Papers 1 and 3

Overview

Profit as an incentive and a signal to other firms, how entry lowers price and profit, normal and supernormal profit, why firms exit loss-making markets and what happens to price, barriers to entry, sunk costs as a barrier to exit, profit as a source of growth finance, and freedom of entry and exit.

What you need to know

Answer each one before you reveal it.

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Key term

Explain what happens to price and profit as new firms enter a profitable market.

Key term

Define normal profit.

Key term

Define supernormal profit.

Questions from this subtopic

Each one with the model answer underneath.

  1. 1

    Why is profit described as an incentive in a market economy?

    Model answer

    The prospect of profit is what persuades entrepreneurs to bear risk and commit resources, so it drives supply towards the goods consumers value most.

  2. 2

    What signal does high profit in an industry send to other firms?

    Model answer

    It signals that returns there are above those available elsewhere, which attracts new firms into the market.

  3. 3

    Explain what happens to price and profit as new firms enter a profitable market.

    Model answer

    Supply increases, so the market price falls and profit per firm is competed down towards the normal level.

  4. 4

    Define normal profit.

    Model answer

    Normal profit is the minimum return needed to keep the entrepreneur's resources in their present use, and economists treat it as a cost.

  5. 5

    Define supernormal profit.

    Model answer

    Supernormal profit is any profit above normal profit, that is, a return greater than the resources could earn in their next best use.

  6. 6

    Why do firms leave a market in which losses persist?

    Model answer

    The resources tied up there would earn more elsewhere, so once the losses cannot be reversed the owners withdraw and redeploy them.

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