2 已知某人的效应函数 U=xy 。他打算购买 x 和 y 两种商品,当其每月收入为 2400 元。 ps=2 元 py=4 ,试问 ( 1 )为获得最大效用,他应该如何选择商品 X 和商品 y 的购买组合。 ( 2 )货币的边际效用是多少 ( 3 )均衡状态下的总效用是多少?
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