試題詳解

12. (5%) Use the midpoint method to calculate the percentage change in weekly quantity of facial masks rationing between week 6 and week 1, and then use your answers to calculate the elasticity of demand assuming the quantity of facial masks rationed in week 6 and week 1 are the actual quantity demanded for each corresponding price, holding other things equal. Which of these statements are true?
(A)The percentage change in quantity demanded for facial masks is greater than 70%.
(B) The percentage change in quantity demanded is likely smaller if week 7 data were used.
(C) The elasticity of demand has a magnitude smaller than 3.
(D) The demand for facial masks is elastic.
(E) None of the above.