PQ=1000,需求彈性是多少? - 經濟

By Rachel
at 2013-02-05T22:24
at 2013-02-05T22:24
Table of Contents
如題 PQ=1000 求需求彈性為何?
兩邊同時+對數
lnPQ=ln1000
>>lnP+lnQ=ln1000
請問上面式子是對什麼微分變成下面式子呢?? 天阿 全微分嗎?
不太懂全微分的定義 跟偏微分有啥不同嗎= =??
>>dlnP+dlnQ=0
>>dlnQ=-dlnP
>> -(dlnQ/dlnP)=1
所以需求彈性=1.............= =
這是解答寫的...蠻奇怪的
如果是用E=-(dQ/Q)/(dP/P) 這種解法還比較簡單...
Q=1000*P^-1
dQ/dP=-1000*P^-2
P/Q=P/(1000*P^-1)
E=-1000*P^-2*P/(1000*P^-1)=1
這樣還比較好算吧...
--
兩邊同時+對數
lnPQ=ln1000
>>lnP+lnQ=ln1000
請問上面式子是對什麼微分變成下面式子呢?? 天阿 全微分嗎?
不太懂全微分的定義 跟偏微分有啥不同嗎= =??
>>dlnP+dlnQ=0
>>dlnQ=-dlnP
>> -(dlnQ/dlnP)=1
所以需求彈性=1.............= =
這是解答寫的...蠻奇怪的
如果是用E=-(dQ/Q)/(dP/P) 這種解法還比較簡單...
Q=1000*P^-1
dQ/dP=-1000*P^-2
P/Q=P/(1000*P^-1)
E=-1000*P^-2*P/(1000*P^-1)=1
這樣還比較好算吧...
--
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