A consumer is willing and able to buy 1,000 units of a good at $10, but the consumer's quantity demanded falls to zero if the price rises even a fraction of a cent. The consumer's demand curve is
A) horizontal and is perfectly inelastic.
B) horizontal and is perfectly elastic.
C) vertical and is perfectly elastic.
D) downward sloping from higher prices down to $10 and then horizontal.
Answer: B) horizontal and is perfectly elastic.
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