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单项选择题

The demand for the product of a purely competitive firm is:

A. perfectly elastic.
B. perfectly inelastic.
C. greater than zero but less than one.
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单项选择题Which of the following statements is most accurate regarding the characteristics of a perfectly competitive market

A. Firms’ products are different.
B. The competitors never earn economic profits.
C. Barriers to entry into the market are nonexistent.

单项选择题Which of the following statements about economies of scale is least likely to be correct

A. are dependent on short-run average costs.
B. occur when average unit costs fall with lager firm size.
C. occur when the long-run average cost curve is sloping upward