經濟 凹向原點 凸向原點 - 考試
By Rachel
at 2015-11-26T00:47
at 2015-11-26T00:47
Table of Contents
假設效用函數是U=(x2+y2)1/2,x>0,y>0,則下列敘述何者錯誤?
(A)x與y的邊際效用都遞增,如果x,y?l
(B)x愈大,邊際替代率愈大
(C)無異曲線凹向原點
(D)消費者偏好多樣性的消費
ANS:D
為什麼C選項是凹向原點???
MUX=(x2+y2)-1/2X, MUY=(x2+y2)-1/2Y,
這表示x與y的邊際效用都遞增,如果x,y>l ,
所以以同心圓來看的話是凸向原點吧@@
謝謝各位解答!!
--
(A)x與y的邊際效用都遞增,如果x,y?l
(B)x愈大,邊際替代率愈大
(C)無異曲線凹向原點
(D)消費者偏好多樣性的消費
ANS:D
為什麼C選項是凹向原點???
MUX=(x2+y2)-1/2X, MUY=(x2+y2)-1/2Y,
這表示x與y的邊際效用都遞增,如果x,y>l ,
所以以同心圓來看的話是凸向原點吧@@
謝謝各位解答!!
--
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