18)Which of the following statements about the
a)When a change in a good's price does not change that good's quantity demanded, the demand curve must be vertical.
b)When a change in a good's price does not change that good's quantity demanded, the demand curve must be a rectangular hyperbola
c)When even a tiny rise in a good's price instantly reduces the good's quantity demanded to zero, the price elasticity of demand is said to be perfectly inelastic
d)When even a tiny rise in a good's price instantly reduces the good's quantity demanded to zero, the price elasticity of demand is said to be unit elastic
e)When a change in a good's price does not change that good's quantity demanded, the demand curve must be horizontal.
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