MRS到底為正為負? - 經濟
By Delia
at 2005-10-13T17:33
at 2005-10-13T17:33
Table of Contents
_
效用函數 U(x,y)= U
_
MUdx+ MUdY=dU=0
MRS = dy/dx = -MUx/MUy........(a)
還是....
MRS = -dy/dx = MUx/MUy........(b)
哪一個才是正確的呢?
我的想法為(a),每多消費一單位x,就要你就願意減少
的y數量為何? 因為是減少所以數值為應是負
可是很多教科書都是寫說可是也有很教科書是寫(b)
那到底哪一個是對的?還是兩者皆可?只是看要怎解釋
哪今天如果要你計算MRS,並給定一效用函數,
納對商品偏微後前面到底要不要加"負號"?
--
效用函數 U(x,y)= U
_
MUdx+ MUdY=dU=0
MRS = dy/dx = -MUx/MUy........(a)
還是....
MRS = -dy/dx = MUx/MUy........(b)
哪一個才是正確的呢?
我的想法為(a),每多消費一單位x,就要你就願意減少
的y數量為何? 因為是減少所以數值為應是負
可是很多教科書都是寫說可是也有很教科書是寫(b)
那到底哪一個是對的?還是兩者皆可?只是看要怎解釋
哪今天如果要你計算MRS,並給定一效用函數,
納對商品偏微後前面到底要不要加"負號"?
--
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經濟
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By Zora
at 2005-10-17T06:58
at 2005-10-17T06:58
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at 2005-10-20T00:54
at 2005-10-20T00:54
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at 2005-10-24T07:41
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at 2005-10-24T22:08
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at 2005-10-28T08:28
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