For a natural monopoly, the optimal policy for a regulator to set is a price such that ______.

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问题 For a natural monopoly, the optimal policy for a regulator to set is a price such that ______.

选项 A、the price level equals marginal cost.
B、the price level equals average variable cost.
C、the price level equals average total cost but higher than marginal cost.
D、the price level is lower than marginal cost but higher than average total cost.

答案C

解析
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