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 so Adam Smith he was the one who first invented the invisible hand.
  亚当·斯密首先提出了"看不见的手"
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  There was nothing mathematical in what he said.
  他的理论里没有任何数学的东西
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  Ricardo was the first one to make a model.
  李嘉图第一个建立了模型
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  Marx said, I don't have time to talk about Marx,
  马克思说 我没有太多时间讨论马克思
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  but he had quite elaborate models, actually,
  但事实上他提出了很精妙的模型
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  and his verbal arguments conceal a huge mathematical apparatus.
  他的文字叙述隐含了庞大的的数学论证
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  On his deathbed, by the way, he was trying to learn calculus, incidentally.
  在他临终时 他偶然地在学习微积分
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  So Jevons, Menger and Walras 1871
  1871年杰文斯 门格尔 瓦尔拉斯三人
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  right after Marx's famous Kapital came out in 1867
  就在马克思发表资本论之后
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  they invented the idea of the margin and things like that
  他们提出了边际的概念
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  and the critique therefore of Marx,
  因此批评马克思
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  and Marx was trying to figure out what they were all about.
  马克思正在努力搞清楚他们提出的理论