lin2006204562 发表于 2011-8-3 10:04 
对对,就是衣服换食物的边际替代率为3 ;我的课本是第六版的!这位大哥厉害啊
不是我厉害,是我有闲工夫翻书,别人都忙着做事呢。还是那个建议,以后要注明页码,大家效率都高~
我认为你看的译文翻译有混淆。
你可以在网上搜索原版书(我只有第三版)561页,和你看的版本相比,内容基本没变。
原文是“Suppose that because Karen has a lot of clothing and little food, her
marginal rate of substitution (MRS) of food for clothing is 3. (To get 1 unit of food, she will give up 3 units of clothing.)"
marginal rate of substitution (MRS) of food for clothing 直接翻译就是“食物对衣服的边际替代率 MRS(F for C)”,而“
用x换y”的表示不太精确。
就是 MRS(F for C) = -dC/dF = -3/1 = -3