If household expenditure on electricity remainsconstant when the price of electricity increases, the price elasticity ofdemand for electricity is a
a.One (in absolute value). (Because the total expenditure isconstant, so %P= - %
b.Zero.
c.Greater than one (in absolute value).
d.Less than one (in absolute value).
e.Cannot be determined.
正确答案是A
但是我不懂,我觉得是他的弹性应该是0?因为弹性公式是q的变化量的百分比比上p的变化量的百分比,题目中不管价格怎么变,数量永远不变,所以弹性应该是0啊?
谢谢!


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