高階ECON-ELAS-022
Along a straight-line downward-sloping demand curve, PED:
A. Is the same number at every point because the slope is constant.
B. Falls in absolute value as you move down the curve, from elastic to inelastic.✓ 答案
C. Rises as you move down the curve.
D. Is zero at the midpoint.
解說
Slope is constant on a straight line, but PED uses percentage changes. High on the curve, price is high and quantity is low, so |PED| is large. At the midpoint |PED| = 1, not 0. Lower down, |PED| is less than 1.