The price elasticity of demand equals 1:

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The price elasticity of demand equals 1:

A.whenever the slope of a straight-line demand curve equals zero.

B.whenever the slope of a straight-line demand curve is less than 1 in absolute value.

C.at the midpoint of a straight-line demand curve.

D.whenever the slope of a straight-line demand curve is greater than 1 in absolute value.

正确答案:at the midpoint of a straight-line demand curve.

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