作者akai0928 (so what)
看板Economics
标题Re: [讨论] 可以请问这题怎麽算吗 算好久
时间Wed Feb 6 22:37:43 2013
※ 引述《zs71928 (中肯之王)》之铭言：
: In a perfect competition market, every firm has the same long run total cost
: function as
: TC=q平方+16 and the demand function of the market is Q=1200-20P
: Please answer the
: following questions :
: (a) If the government allow only 200 firms to supply the market in the long
: run, what are the
: market equilibrium price, quantities each firm produced and profit each firm
: made in the long
: run?
supply function: P=MC=2q ---> qs=0.5P
Market supply function: Qs = 200q = 100P
market equilibrium: Qs=Qd --> 100P = 1200-20P --> P*=10
: (b) If the government allows firms to free enter or exit the market, what are
: the market equilibrium
: price, quantities each firm produced and the number of the firms in the long
: run?
题目已经说是完全竞争了
政府允许商厂自由进出变成赘述
由於厂商自由进出
因此长期下仅能赚取正常利润
留在产业的厂商
必然在MES处生产
故一般都列式： min LAC = q + 16/q
f.o.c. dLAC/dq = 0 --> 1 - 16/q^2 = 0 ---> q* = 4
P* = LAC* = 4 + 4 = 8
Q = 1200 - 20*8 = 1040
n = 1040/4 = 260
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: 第一题我算出来 q=5 Q=1000 P=10 每家厂商利润9
: 第二题是我卡住的地方 q跟p跟厂商家数都变动 Q总产量应该不会也变动吧
: 有三个变数实在不知道怎麽算
: 徵求高手解答
: 谢谢
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