（)市场达到均衡后，不存在长期利润。

A.AR=LAC

B.经济利润为零

C.MR=LMC

D.存在经济利润

E.LAC达到极小值

A.条件一、条件二

B.上述所有条件

C.条件一、条件三

D.条件二、条件三

假设某一特殊行业的信息如下:

Q^D=6500-100P市场需求

Q^S=1200P市场供给

C(q)=722+q²/200厂商总成本

MC(q)=2q/200

厂商边际成本

假定所有厂商完全同质，而且市场是完全竞争的。

(1)计算均衡价格、均衡产量、厂商供给产量和每家厂商的利润。

(2)在长期将有厂商进入还是退出市场？试解释。进入或退出将会对市场产生何种影响？

(3)在长期，每家企业销售其产品的最低价格为多少？利润是正的、负的还是为零？解释你的结论。

(4)在短期，每家企业销售其产品的最低价格为多少？利润是正的、负的还是为零？解释你的结论。

Suppose you are give the following information about a particular industry:

Q^D=6500-100P Market demand

Q^S=1200P Market supply

C(q)=722+q²/200 Firm total cost function

MC(q)=2q/200 Firm marginal cost function

Assume that all firms are identical and that the market is characterized by pure competition.

a. Find the equilibrium price, the equilibrium quantity, the output supplied by the firm, and the profit of each firm.

b. Would you expect to see entry into or exit from the industry in the long run？ Explain. What effect will entry or exit have on market equilibrium？

e. What is the lowest price at which each firm would sell its output in the long run？ Is profit positive, negative, or zero at this price？ Explain.

d. What is the lowest price at which each firm would sell its output in the short run？ Is profit positive, negative, or zero at this price？ Explain.

A.可以在长期平均成本上升阶段实现

B.是零利润均衡

C.一定在长期平均成本最低点实现

D.可以在价格高于平均成本时实现

A.劳动市场在效率工资下出清

B.经济在充分就业状态下运行

C.存在劳动力的过剩供给

D.不存在非自愿失业

A.在长期均衡实现时，相较之前，企业的利润没有发生变化

B.总需求减少的瞬间，从长期和短期两个角度看，都出现产品过剩，供过于求

C.在长期均衡实现时，相较之前，工人的福利水平有所降低

D.恢复长期均衡一定会经过短期均衡恢复的过程

A.事实上不存在该房产

B.房价明显高于周边相同或相近档次楼盘

C.精装修楼盘装修部份价款明显高于市场装修价格水平

D.达到入住条件后，借款人所购房产一直处于空置状态