WAEC Economics 2008 Question 7

Question 7

Theory of Demand

If goods P and Q are jointly demanded, an increase in the price of P will likely

  1. A.leave the demand for Q constant but reduce the quantity demanded of P
  2. B.reduce the quantity of P but increase the price of Q
  3. C.increase the quantity supplied of Q
  4. D.decrease the quantity demanded of Q.
Show the answer and explanation

Answer: D (decrease the quantity demanded of Q.)

Explanation

Jointly demanded goods are used together; if P becomes dearer, less P is bought and so less Q is needed.