Suppose that three consumers are in the market for good X. Consumer 1's (inverse) demand is PX = 20 ? QX; Consumer 2's (inverse) demand is PX = 20 ? 2QX; and Consumer 3's (inverse) demand is PX = 20 ? 4QX. When PX = $10, the market will demand:
A. 17.5 units and the inverse market demand curve is PX = 20 ? 0.5714QX.
B. 17.5 units and the inverse market demand curve is PX = 60 ? 7QX.
C. ?30 units and the inverse market demand curve is PX = 60 ? 7QX.
D. None of the statements is correct.
Answer: A
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