来自《耶鲁大学开放课程：金融理论 第7集 第7集》

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  maybe in the whole country that's worth 25 trillion,
  全国地产总值可能为25万亿
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  but that went down too so let's say 20 trillion.
  但是也跌了 就算20万亿吧
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  Now how much of the 20 trillion could possibly be in New York City?
  20万亿中有多少在纽约呢
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  I've actually got no idea, but it can't be that much more
  我也不清楚 不过也不会那么多
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  the whole country is 20 trillion.
  全国是20万亿
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  New York can't be worth more than 1 or 2 trillion of the 20 trillion,
  纽约不可能超过1到2万亿
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  so you're not that far off.
  因此结果相差并不远
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  So the deal's not that spectacularly bad
  尽管这笔交易听起来很荒唐
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  although it sounds ridiculous.
  但是也不是超级差
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  Anyway, the point is you can do this in your head.
  最重要的是你能够心算解题
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  So now the next thing that you realize in this example
  这个例子中下一个需要注意的是
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  is how huge a difference a percent makes.
  1%究竟有多大