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Introducing the Market

Excess demand, excess supply and market forces

  • 3 things to know
  • Papers 1 and 3

Overview

Excess demand and excess supply and how market forces remove them, unsold stock and sell-out concerts as signals, the invisible hand, maximum and minimum prices, rationing a shortage without price, how fast markets clear, late-day price cuts, and pricing above equilibrium.

What you need to know

Answer each one before you reveal it.

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Process

Explain how a market that is out of equilibrium returns to it.

Key term

What is excess demand?

Key term

Describe how market forces remove excess demand.

Questions from this subtopic

Each one with the model answer underneath.

  1. 1

    What is excess demand?

    Model answer

    Excess demand is a shortage, in which at the prevailing price the quantity demanded exceeds the quantity supplied.

  2. 2

    Where on a supply and demand diagram is excess demand shown?

    Model answer

    It is the horizontal gap between the demand and supply curves at any price below the equilibrium.

  3. 3

    Describe how market forces remove excess demand.

    Model answer

    Unsatisfied buyers bid the price up, which contracts demand and extends supply until the two are equal again.

  4. 4

    What is excess supply?

    Model answer

    Excess supply is a surplus, in which at the prevailing price the quantity supplied exceeds the quantity demanded.

  5. 5

    Describe how market forces remove excess supply.

    Model answer

    Unsold stock leads producers to cut the price, which extends demand and contracts supply until the market clears.

  6. 6

    What signal does a growing pile of unsold stock give a producer?

    Model answer

    It signals that the price is above the market-clearing level and should be cut, or that output should be reduced.

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