来自《耶鲁大学开放课程：金融理论 第4集 第4集》

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  own various different trees.
  拥有着不同的树
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  So to the old economy we add something new.
  我们在旧的经济体系加入了新的东西
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  And now Fisher's ingenious insight was that
  这时Fisher创造性地注意到
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  if you think about this, which we will for a little
  如果你去想想 这要耽误我们一点时间
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  while, you'll be able to discover that you can simplify
  你会发现你可以很简单地
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  this economy back down to the economy we began with.
  把这个经济体系转化为我们最初研究的那个
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  So you can start talking about assets and interest and all
  这样你能立刻得到关于资产 利润
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  kinds of others things using the same analysis as before.
  等等的结论 用的还是之前的分析
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  So with my last thought here, what does interest have to do
  那带着我刚才的想法 如果把
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  interest have to do with P_X over P_Y?
  P_X除以P_Y会带来什么好处
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  What is P_X over P_Y?
  P_X除以P_Y是什么
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  Suppose they're both apples.
  假设它们都是苹果