来自《耶鲁大学开放课程：金融理论 第10集 第10集》

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  such that if you take the present value of that same coupon payment forever
  要找到这样的付息 如果持续付款
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  it's just going to be worth 100 which is that number.
  现值将价值100
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  And how do you figure out the coupon payment?
  那么如何找出付息呢
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  Well, you do it by backward inductions.
  通过逆向归纳法
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  Figure out the present value.
  计算出现值
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  Do it by backward induction just as we did.
  从后向前做 就像刚才一样
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  But we've gotten a lot of information.
  我们已经得到了了大量的信息
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  We've gotten this number at every period.
  我们已经得到了每一个时期的数字
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  So by doing it by backward induction instead of just doing the long exponential calculation,
  通过逆向归纳 而非冗长的指数计算
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  by doing it by backward induction
  通过逆向归纳
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  we've produced the present value at every time in the future.
  我们可以得出每一个在未来时间的现值
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  Now, that's an incredibly important number in mortgages.
  这是一个在抵押贷款中非常重要的数字