来自《耶鲁大学开放课程：金融理论 第2集 第2集》

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  and see how it increased when you gave people more of something
  来观察当给人们更多东西时这些如何增加
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  and whether the rate of increase and how much they smiled and stuff like that
  增长速率如何以及他们微笑的次数之类
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  whether that would actually change in a lesser and lesser way
  当增加越来越多的效用的是时候
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  as you add more and more utility.
  这些变化是不是越来越慢
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  Well, they abandoned that sort of thing eventually.
  最终他们放弃了
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  But anyway, they kept the idea of diminishing marginal utility.
  但他们依然认为边际效用不断递减
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  So we want to keep the idea that Ui(x) and Vi(y)
  我们依然同意 Ui(x)和Vi(y)
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  show diminishing marginal utility.
  表现出边际效用递减
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  So the way of saying that, I told you this is one of the
  这个方式 我告诉过你们
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  so the first handout in the reading list
  阅读清单上第一份讲义
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  was review of mathematics you should know,
  是对你应该掌握的数学知识的复习
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  or if you don't know you have to learn,
  如果你不知道学什么