问题如下图:
选项:
A.
B.
C.
解释:
题目不是问哪个价格的情况下会有会有新厂商进入,那只有135大于51,不是应该选A吗
NO.PZ2018062003000067 问题如下 For a market of perfecompetition, the manschele is fineP = 165– 3Q (for Q ≤ 55). For eacompany in the long-run, the totcost is given by: 125 + Q + 5Q2, the average cost is given by: 125/Q + 1 + 5Q, the margincost is given by: 1 + 10Q. whiof the following price, new competitors are most likely to enter? A.135. B.51. C.45. B is correctIn a perfectly competitive market, for eacompany in the long-run, only when MC = = P, woulthe equilibrium expectewe cthe equation:MC=A1 + 10Q = 125/Q + 1 + 5Q, Q=5.thtime, P=M1 + 10Q = 51If the priis higher th51, new competitors will enter for economic profits .考点完全竞争市场解析在完全竞争市场中,存在条件 MC = = P,联立MC=A1 + 10Q = 125/Q + 1 + 5Q, Q=5.,解得P=M1 + 10Q = 51。注意到,之所以不用需求函数 P = 165– 3Q参与联立是因为这里给的是整个市场的需求函数,而非单个厂商的 。但是题目给定的MC,AC都是单个厂商的关系式,所以整个市场的需求函数与它们并不匹配,不能参与联立。 这道理和另一道相似的题最后求P用的方法不一致,另一道题做法P=MC=5*5+1=26,应该是这个答案。并且另一道题是因题目中P的公式是整个市场的,所以不匹配,因此不适用。。。我觉得很混乱,请辨析一下
NO.PZ2018062003000067 问题如下 For a market of perfecompetition, the manschele is fineP = 165– 3Q (for Q ≤ 55). For eacompany in the long-run, the totcost is given by: 125 + Q + 5Q2, the average cost is given by: 125/Q + 1 + 5Q, the margincost is given by: 1 + 10Q. whiof the following price, new competitors are most likely to enter? A.135. B.51. C.45. B is correctIn a perfectly competitive market, for eacompany in the long-run, only when MC = = P, woulthe equilibrium expectewe cthe equation:MC=A1 + 10Q = 125/Q + 1 + 5Q, Q=5.thtime, P=M1 + 10Q = 51If the priis higher th51, new competitors will enter for economic profits .考点完全竞争市场解析在完全竞争市场中,存在条件 MC = = P,联立MC=A1 + 10Q = 125/Q + 1 + 5Q, Q=5.,解得P=M1 + 10Q = 51。注意到,之所以不用需求函数 P = 165– 3Q参与联立是因为这里给的是整个市场的需求函数,而非单个厂商的 。但是题目给定的MC,AC都是单个厂商的关系式,所以整个市场的需求函数与它们并不匹配,不能参与联立。 1.请问这里为什么不能用P=MC联合立?165– 3Q =1 + 10Q.2.怎么区分啥时候是P是代表整个市场,还是代表单个厂商3.不是P=MR=MC么,为啥会出现AC?在讲义中哪里有出现呢
NO.PZ2018062003000067 问题如下 For a market of perfecompetition, the manschele is fineP = 165– 3Q (for Q ≤ 55). For eacompany in the long-run, the totcost is given by: 125 + Q + 5Q2, the average cost is given by: 125/Q + 1 + 5Q, the margincost is given by: 1 + 10Q. whiof the following price, new competitors are most likely to enter? A.135. B.51. C.45. B is correctIn a perfectly competitive market, for eacompany in the long-run, only when MC = = P, woulthe equilibrium expectewe cthe equation:MC=A1 + 10Q = 125/Q + 1 + 5Q, Q=5.thtime, P=M1 + 10Q = 51If the priis higher th51, new competitors will enter for economic profits .考点完全竞争市场解析在完全竞争市场中,存在条件 MC = = P,联立MC=A1 + 10Q = 125/Q + 1 + 5Q, Q=5.,解得P=M1 + 10Q = 51。注意到,之所以不用需求函数 P = 165– 3Q参与联立是因为这里给的是整个市场的需求函数,而非单个厂商的 。但是题目给定的MC,AC都是单个厂商的关系式,所以整个市场的需求函数与它们并不匹配,不能参与联立。 完全竞争市场MR=MC用已知公式推导出MR=165-6Q然后用MC=1+10Q来里联立方程,求Q=10.25,再带入p的公式算出来P=134.25
NO.PZ2018062003000067问题如下For a market of perfecompetition, the manschele is fineP = 165– 3Q (for Q ≤ 55). For eacompany in the long-run, the totcost is given by: 125 + Q + 5Q2, the average cost is given by: 125/Q + 1 + 5Q, the margincost is given by: 1 + 10Q. whiof the following price, new competitors are most likely to enter?A.135.B.51.C.45.B is correctIn a perfectly competitive market, for eacompany in the long-run, only when MC = = P, woulthe equilibrium expectewe cthe equation:MC=A1 + 10Q = 125/Q + 1 + 5Q, Q=5.thtime, P=M1 + 10Q = 51If the priis higher th51, new competitors will enter for economic profits .考点完全竞争市场解析在完全竞争市场中,存在条件 MC = = P,联立MC=A1 + 10Q = 125/Q + 1 + 5Q, Q=5.,解得P=M1 + 10Q = 51。注意到,之所以不用需求函数 P = 165– 3Q参与联立是因为这里给的是整个市场的需求函数,而非单个厂商的 。但是题目给定的MC,AC都是单个厂商的关系式,所以整个市场的需求函数与它们并不匹配,不能参与联立。 我的理解是厂商只有当市场中存在economic profit 0的时候新的厂商才会更愿意选择进入,当然等于0的时候也可以进入,虽然economic profit=0,但是此时可以赚取accounting profit。但是题目问的是最有可能的价格,我觉得应该是A,解析中也提到了,价格应该大于51。
NO.PZ2018062003000067问题如下For a market of perfecompetition, the manschele is fineP = 165– 3Q (for Q ≤ 55). For eacompany in the long-run, the totcost is given by: 125 + Q + 5Q2, the average cost is given by: 125/Q + 1 + 5Q, the margincost is given by: 1 + 10Q. whiof the following price, new competitors are most likely to enter?A.135.B.51.C.45.B is correctIn a perfectly competitive market, for eacompany in the long-run, only when MC = = P, woulthe equilibrium expectewe cthe equation:MC=A1 + 10Q = 125/Q + 1 + 5Q, Q=5.thtime, P=M1 + 10Q = 51If the priis higher th51, new competitors will enter for economic profits .考点完全竞争市场解析在完全竞争市场中,存在条件 MC = = P,联立MC=A1 + 10Q = 125/Q + 1 + 5Q, Q=5.,解得P=M1 + 10Q = 51。注意到,之所以不用需求函数 P = 165– 3Q参与联立是因为这里给的是整个市场的需求函数,而非单个厂商的 。但是题目给定的MC,AC都是单个厂商的关系式,所以整个市场的需求函数与它们并不匹配,不能参与联立。 老師,我知道原理但不會求q