单项选择题

A perfectly competitive firm will not expand its output beyond the quantity where:

A. the market price is equal to its marginal cost.
B. its marginal revenue is positive.
C. the marginal cost is greater than marginal revenue.

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单项选择题Natural monopolies exist because they can produce at lower costs with greater output, which means there are economies of scale. Which of the following industries is typically a natural monopoly

A. Technology.
B. Utilities.
C. Oil.

单项选择题Which of the following will cause an increase in the demand for labor

A. An increase in the labor supply.
B. A decrease in labor productivity.
C. An increase in the demand for the final good or service.