6. Which of the following statements about demand curves is TRUE? I. The "Law of Demand" holds if a consumer's marginal benefit is lower at higher quantities consumed than it is at lower quantities consumed. II. If the consumer's marginal benefit is the same no matter what quantity is consumed, then her demand curve will be vertical. III. All else equal, the marginal benefit of consuming a normal good will be higher for richer consumers than for poorer consumers. a) III only. b) I and II only. c) I and III only. d) I only.
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