寡占市場的問題...(急) - 經濟

By Zora
at 2009-03-14T23:19
at 2009-03-14T23:19
Table of Contents
※ 引述《bearching (Pandora`s Box)》之銘言:
: ※ 引述《SsimpleLlove ( ilobimd)》之銘言:
: : 下下禮拜要參加研究所考試了,這邊有一個問題困擾我
: : 懇請各位能幫幫我。。。
: : --------------------------
: : Two firms compete by choosing price. their demand functions are
: : Q1=20-P1+P2 and Q2=20+P1-P2
: : where P1 and P2 are the price charged by each firm respectively and
: : Q1 and Q2 are the resulting demands. Note that the demand for each good
: : depends only on the difference in price; if the two firms
: : colluded and set the same price, they could make that price as
: : high as they want, and earn infinite profits. Marginal costs are zero.
: : 1. Suppose the two firms set their prices at the same time. Find the
: : resulting Nash equilibrium. What price will each firm charge,
: : how much will it sell, and what will its profit be?
: : 2. Suppose Firm 1 sets its price first and then Firm 2 sets its price.
: : What price will each firm charge, how much will it sell,
: : and what will its profit be?
: : 這是在講秦柏霖勾結是嗎??? 怎麼算啊????
: 這個都是在說Bertrand價格競爭
: 第一題有點類似Cournot競爭 第二題類似Stockelberg競爭
: 一樣都是先算兩家的利潤=TR-TC
: 然後再分別對兩家的利潤用P微分(第一家用P1 第二家用P2)
: 可以得到兩家的反應函數 類似P1=a+bP2這樣的函數
: 第一題是用兩個反應函數解聯立就可以得到
: 第二題因為說第一家先第二家後,所以第一家在做決策的時候要把第二家的決策
: 考慮進去,簡單說就是把第二家的反應函數P2=a+bP1帶進去第一家的利潤裡面的P2
: 然後對再對第一家的利潤用P1微分,就解出來了~
可是題目不是有講到勾結嗎?
有講到說倆家勾結再一起的話可以得到利潤最大
那不是用秦柏林勾結去算嗎.?
奈許均衡就是庫諾的解嗎?
謝謝你幫我解答:D
--
: ※ 引述《SsimpleLlove ( ilobimd)》之銘言:
: : 下下禮拜要參加研究所考試了,這邊有一個問題困擾我
: : 懇請各位能幫幫我。。。
: : --------------------------
: : Two firms compete by choosing price. their demand functions are
: : Q1=20-P1+P2 and Q2=20+P1-P2
: : where P1 and P2 are the price charged by each firm respectively and
: : Q1 and Q2 are the resulting demands. Note that the demand for each good
: : depends only on the difference in price; if the two firms
: : colluded and set the same price, they could make that price as
: : high as they want, and earn infinite profits. Marginal costs are zero.
: : 1. Suppose the two firms set their prices at the same time. Find the
: : resulting Nash equilibrium. What price will each firm charge,
: : how much will it sell, and what will its profit be?
: : 2. Suppose Firm 1 sets its price first and then Firm 2 sets its price.
: : What price will each firm charge, how much will it sell,
: : and what will its profit be?
: : 這是在講秦柏霖勾結是嗎??? 怎麼算啊????
: 這個都是在說Bertrand價格競爭
: 第一題有點類似Cournot競爭 第二題類似Stockelberg競爭
: 一樣都是先算兩家的利潤=TR-TC
: 然後再分別對兩家的利潤用P微分(第一家用P1 第二家用P2)
: 可以得到兩家的反應函數 類似P1=a+bP2這樣的函數
: 第一題是用兩個反應函數解聯立就可以得到
: 第二題因為說第一家先第二家後,所以第一家在做決策的時候要把第二家的決策
: 考慮進去,簡單說就是把第二家的反應函數P2=a+bP1帶進去第一家的利潤裡面的P2
: 然後對再對第一家的利潤用P1微分,就解出來了~
可是題目不是有講到勾結嗎?
有講到說倆家勾結再一起的話可以得到利潤最大
那不是用秦柏林勾結去算嗎.?
奈許均衡就是庫諾的解嗎?
謝謝你幫我解答:D
--
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