基礎ECON-ELAS-017
Price rises from $10 to $12 and quantity demanded falls from 100 to 80. Using the original-price formula, |PED| is:
A. 0.5.
B. 2.
C. 1.✓ 答案
D. 20.
解說
Percentage change in quantity is 20/100 = 20%. Percentage change in price is 2/10 = 20%. |PED| = 20/20 = 1, unit elastic on this original-base calculation. 0.5 would invert the ratio. 20 confuses a percentage with the elasticity itself.