perpetuities

基本解释

The present value of this annuity is, therefore, the difference between the values of the two perpetuities.
使用年金桌子的现在价值是比较简单的方式。
The only difference between the two perpetuities is that the first one also provides a cash flow in each of the years 1 t.
这两者之间的唯一区别是前者也提供了一个从1年到t 年每一年的现金流。
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.
也有长达百年的债券，甚至有永久债券--比如在英国，不列颠控股，没有过期时间，永不到期。

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
耶鲁公开课 - 金融市场课程节选

When the GST was originally enacted, most state laws included the common law Rule against Perpetuities (RAP) or some similar rule.
FORBES: Obama Estate Tax Budget Proposals