JAMB Economics 1990 Question 11

Question 11

Theory of Demand

The demand curve would shift to the left when there is a rise in

  1. A.the price of a substitute
  2. B.the price of a complement
  3. C.income
  4. D.the supply of the commodity
Show the answer and explanation

Answer: B (the price of a complement)

Explanation

If a complement becomes dearer, people buy less of it and so less of this good at every price: demand shifts left. A dearer substitute or higher income shifts it right.