One more thing that I think would be relevant to the-- there's also the annuity formula.

我认为还有一个与之有关的问题就是,还有一个年金公式

耶鲁公开课 - 金融市场课程节选

A good example of an annuity is a mortgage on a house.

关于年金的一个很好的例子就是房屋抵押

耶鲁公开课 - 金融市场课程节选

What is the present value of an annuity?

那么年金的现值又是什么呢

耶鲁公开课 - 金融市场课程节选

This is just the annuity formula, remember?

这就是年金公式,记得吗

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We now have annuity mortgages.

于是出现了年金抵押贷款

耶鲁公开课 - 金融市场课程节选

That's called an annuity.

它就叫做年金

耶鲁公开课 - 金融市场课程节选