下列哪项与失业金的给付期无关（）。
A. 失业者年龄
B. 缴费年限
C. 失业率
D. 失业者失业前收入
E. 失业时间
[单选]Competitive markets are characterized by
A. a small number of buyers and sellers.
B. unique products.
C. the interdependence of firms.
D. free entry and exit by firms.
[单选]For a firm operating in a competitive industry, which of the following statements is not correct?
A. Price equals average revenue.
B. Price equals marginal revenue.
C. Total revenue is constant.
D. Marginal revenue is constant.
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