单项选择题

In the long-run equilibrium of a competitive market with identicalfirms, what is the relationship between price P,marginal cost MC,and average total cost ATC?( )

A．P >MC andP >ATC.
B．P >MC andP =ATC.
C．P =MC andP >ATC.
D．P =MC andP =ATC.

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多项选择题

Which of the following are the cases when centrifugal force occurs ____？
A、Purchase fewer good from outside the region, thereby reducing the cost of trade
B、The demand for labor increases
C、manufacturers move from other regions to the local regions, so the profits to the local manufactures decline
D、Reduce the nominal wages paid to workers, hence labor flows

试述布坎南关于政府失败的表现及原因。

答案：正确答案：
（1）公共决策失效：a社会实际上并不存在作为政府决策目标的所谓公共利益。b即使现实社会中存在着某种意...