At the midpoint of a straight-line demand curve, the price elasticity of demand is:

题目：At the midpoint of a straight-line demand curve, the price elasticity of demand is:

At the midpoint of a straight-line demand curve, the price elasticity of demand is:

A.equal to one.

B.zero.

C.greater than one.

D.less than one.


正确答案：equal to one.