单项选择题

Which of the following statements is most accurate A method of production is economic efficiency when:（）

A. It uses the most advanced science and technology.
B. The cost of fund capital is as low as possibie.
C. The cost of producing a given level of output is as low as possible.

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单项选择题The long-run production decision differs from the short-run production decision in that:（）

A. variable costs can be changed in the short run but not the long run.
B. variable costs can be changed in the long run but not the short run.
C. fixed costs can be changed" in the long run but not the short run.

单项选择题In a competitive market, the gains to society are maximized under which of the conditions described below Marginal Benefit Marginal Cost Producer Surplus Consumer Surplus（） ①A. $1.25 $1.00 $25 $25 ②B. $1.50 $1.50 $45 $30 ③C. $2.50 $2.50 $35 $35

A. ①
B. ②
C. ③