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A perpetuity is an asset or a contract that pays a fixed amount of money each time period, forever.
永续年金是一种财产或者合同,规定在每一时间段内,支付一定数量的货币,直至永远
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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
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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
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The simplest thing is something called a consol or perpetuity.
其中最简单的东西叫做公债或叫永续年金
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There have also been one hundred-year bonds and there have also been perpetuities that-- in the UK, for example, the British Consoles-- have no expiration date and they have infinite maturity.
还有更长期的一百年债券,还有一种永续年金,比如说英国的大英统一公债,没有过期日,永不到期
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What is the present value of an annuity?
那么年金的现值又是什么呢
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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
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That's called an annuity.
它就叫做年金
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