倍乘性表明，对任一信道，其n阶容量代价函数都是一阶容量代价函数的n倍。
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Which of the following statements is correct?__________________
A. Both a competitive firm and a monopolist are price takers.
Both a competitive firm and a monopolist are price makers.
C. A competitive firm is a price taker, whereas a monopolist is a price maker.
D. A competitive firm is a price maker, whereas a monopolist is a price taker.
A benefit to society of the patent and copyright laws is that those laws__________________
A. help to keep prices down.
B. help to prevent a single firm from acquiring ownership of a key resource.
C. encourage creative activity.
D. discourage the production of inefficient products.
Which of the following is not a characteristic of a monopoly?__________________
A. barriers to entry
B. one seller
C. one buyer
D. a product without close substitutes
Which of the following is not a reason for the existence of a monopoly?__________________
A. sole ownership of a key resource
B. patents
C. copyrights
D. diseconomies of scale
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