3) My ratio of the marginal utility of coffee to the margina

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3) My ratio of the marginal utility of coffee to the marginal utility of doughnuts is four. This im
3) My ratio of the marginal utility of coffee to the
marginal utility of doughnuts is four. This implies that
A) I always eat doughnuts with my coffee
B) a cup of coffee is four times less valuable to me than a doughnut
C) a cup of coffee is four times more valuable to me than a
doughnut
D) The price ratio is four to one
请给出理由,重点是C选项对或错在哪儿.谢谢

C对
用排除法的话,A跟话题无关所以可以排除,D说的是价格,而句子中说的是咖啡或者甜甜圈对我的影响,所以也可以排除.
那么就看B和C
B和C正好是相反的两个答案,那我们就进一步分析句意了.My ratio of the marginal utility of coffee to themarginal utility of doughnuts is four.
翻译成中文就是：对我来说,咖啡的边际效用跟甜甜圈的边际效用是4:1.
那么关键就看“边际效用”是什么意思了?在经济学中,效用是指商品满足人的欲望的能力,或者说,效用是指消费者在消费商品时所感受到的满足程度.边际效用是指消费者在一定时间内增加一单位商品的消费所得到的效用量的增量.,从大致的意思上就可以得出,在这个句子中,边际效用指的是咖啡或者甜甜圈带给“我”的满足感,即价值了.
那么
咖啡的边际效用跟甜甜圈的边际效用是4:1.
可以更浅显的理解为
咖啡带给我的价值跟甜甜圈带给我的价值是4:1.
这跟C中表达的意思是相符的.
因此C对.

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