来自《耶鲁大学开放课程：金融理论 第7集 第7集》

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  it grows at 5.3 percent, but then inflation is 3 percent,
  每年增值百分之五点三而通胀率只有三
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  so I take that into account
  于是你想
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  and I figure out how much to spend the year after that,
  这样就能算出一年花多少合适
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  but then I'm going to get 115,000 more of that
  但是我想让十一万五更多增值
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  so I'll save something, maybe more from my next thing
  我会存点别的 也许变得更值钱
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  and then I'll deposit that at another 5.3 percent,
  然后把这个东西以五点三的利率存入银行
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  and I have to take into account inflation at 3 percent.
  这样又必须考虑百分之三的通胀
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  It sounds like it's going to get very complicated.
  听起来很复杂
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  How are you going to figure this out?
  这可怎么算呢
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  But in fact it's very simple,
  可实际很简单
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  and Irving Fisher pointed the way to do it
  Irving Fisher提供了一条捷径
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  and we can now do it in our heads.
  现在我们可以自己算了