Martha's utility function is U(x; y) = min(x + 2y; 2x + y). George's utility function isU(x; y) = min(2x + 4y; 4x + 2y). If George and Martha have the same income and face the same prices for the goods x and y :

(a) George and Martha will both demand the same amount of y.

(b) Martha will always prefer George's consumption bundle to her own.

(c) George will always prefer Martha's consumption bundle to his own.

(d) George will demand more x than Martha demands.

(e) None of the above.

 

答案选A。为什么啊？如果X，Y的价格分别为2,1,则预算线和无差异曲线的一部分重合，这时两人对Y的需求就不一定相等啊…

谢谢