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Suppose people are in consumer equilibrium buying 10,000 units of good X at a given price. Then the price of good X falls to $0. It follows that people will buy more of good X and that the marginal utility of the last additional unit they buy will be __________ the __________ of the 10,000th unit. a. the same as; marginal utility b. greater than; marginal utility c. greater than; average utility d. lower than; marginal utility