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A vertical demand curve: a. is unit elastic. b. is perfectly elastic. c. is perfectly inelastic. d. has elastic and inelastic portions.

User Tyniqua
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A vertical demand curve:

c. is perfectly inelastic.

Explanation: A perfectly inelastic demand curve is vertical, indicating that there is no change in quantity demanded regardless of changes in price. In other words, the quantity demanded remains constant regardless of price fluctuations. This indicates that the demand is completely unresponsive to changes in price, resulting in a perfectly inelastic demand curve.
User Jordan Duncan
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