单项选择题

Which statement about renewable and non-renewable resources is most accurate（）

A. The price of a renewable resource is the present value of its expected next-period price.
B. Land is considered a renewable resource.
C. The known stock of a non-renewable resource must decrease as the resource is used.

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单项选择题
A monopolist will maximize profits by:（）

A. producing at the point where price is equal to MR.
B. producing at the output level where marginal revenue equals average variable cost and charging a price along the demand curve that corresponds to the output rate.
C. producing at the output level where marginal revenue equals marginal cost and charging a price on the demand curve that corresponds to the output rate.
单项选择题
A firm operating under perfect competition will experience economic losses when which of the following conditions exists（）

A. Marginal revenue is greater than average total cost.
B. Market price is less than average total cost.
C. Marginal cost = average total cost = marginal revenue = price.
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