[考題] 經濟-無異曲線
1-以太陽餅為橫軸變數,方塊酥為縱軸變數,繪製甲的無異曲線
當方塊酥qty>太陽餅時,IC的斜率固定為-2,當太陽餅qty>方塊酥時
IC的斜率固定為-1/2。由此,甲認為14個太陽餅和20個消費組合
和26個太陽餅與方塊酥多少個無異?
A)6 B)8 C)11 D)16
Ans:C)11
疑問:我的算法如下,但沒這個答案,請問那邊錯了
設要z個方塊酥
Z-20/26-14 =-1/2 z=14
2-下列效用函數,何者的無異曲線不是凸性?
A)U(x,y)=xy B)U(x,y)=(x平方+y平方)1/2次方
c)U(x,y)=X 1/2次方+y D) U(x,y)=lnx+ lny
ans:B)
疑問:請問為何不能選c呢? C看起來只受X影響,無異曲線應該沒有
凸向原點?
謝謝!
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