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+q卐

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+q卐

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.