来自《耶鲁大学开放课程：金融理论 第11集 第11集》

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  It's so simple minded to think this way.
  这么想的话会很简单
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  It's amazing; the public is so confused about this.
  但现实是民众对此都很疑惑
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  Suppose you have a baby boom generation.
  假设你有婴儿潮时一代人
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  So you're going on with all these mothers,
  你跟这些母亲一起成长
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  we're back to the mother and the daughter with 1 million.
  我们回到那个借一百万的母亲和女儿
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  So let's say there's one mother, one daughter, one person in every generation.
  假设有一个母亲一个女儿每代都只有一个
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  All of a sudden, there's a baby boom generation,
  突然出现了一个婴儿潮
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  but of course, to be old, you have to be young first.
  当然 变老之前肯定会有年轻的时候
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  So let's say in some generation after a bunch of times,
  假设几代人之后
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  there are 2 daughters instead of 1 daughter.
  有了2个女儿而不是1个
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  Each of them is not going to pay--if the tax rate stays the same
  每个人都不去支付 如果税率保持不变
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  and the young daughters now each pay 1,
  每个年轻的女儿都付1