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Introducing the Market

Movements along and shifts of the demand curve

  • 3 things to know
  • Papers 1 and 3

Overview

Movements along against shifts of the demand curve, extensions and contractions of demand, substitutes and complements, normal and inferior goods, and how real incomes, advertising, an ageing population and a health scare shift demand, but a good's own price never does.

What you need to know

Answer each one before you reveal it.

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Process

How does a rise in real incomes affect demand, and does the answer depend on the good, for example holidays?

Key term

Distinguish between a movement along a demand curve and a shift of the curve.

Key term

What is an extension of demand?

Questions from this subtopic

Each one with the model answer underneath.

  1. 1

    Distinguish between a movement along a demand curve and a shift of the curve.

    Model answer

    A movement along the curve is caused only by a change in the good's own price, while a shift is caused by a change in any other determinant of demand.

  2. 2

    What is an extension of demand?

    Model answer

    An extension of demand is a rise in quantity demanded caused by a fall in the good's own price, shown as a movement down the curve.

  3. 3

    What is a contraction of demand?

    Model answer

    A contraction of demand is a fall in quantity demanded caused by a rise in the good's own price, shown as a movement up the curve.

  4. 4

    In which direction does an increase in demand shift the curve?

    Model answer

    An increase in demand shifts the curve to the right, so a greater quantity is demanded at every price.

  5. 5

    What is a substitute good?

    Model answer

    A substitute is a good that can be used in place of another, so a fall in the price of one reduces demand for the other.

  6. 6

    The price of coffee falls sharply. Explain what happens to the demand curve for tea.

    Model answer

    The demand curve for tea shifts to the left, because consumers switch towards the cheaper substitute.

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