查看“︁永续年金”︁的源代码

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'''永续年金'''是一种永无止境的年金或者现金支付流<ref>{{Cite news|url=https://www.investopedia.com/terms/p/perpetuity.asp?layout=infini&v=5D&orig=1&adtest=5D|title=Perpetuity|last=Staff|first=Investopedia|date=2003-11-24|newspaper=Investopedia|accessdate=2018-11-14|language=en-US|archive-date=2018-08-25|archive-url=https://web.archive.org/web/20180825073907/https://www.investopedia.com/terms/p/perpetuity.asp?layout=infini&v=5D&orig=1&adtest=5D|dead-url=no}}</ref>。现存的永续年金很少，英国政府过去曾发布过它们并且最终都于2015年被赎回。
==公式==
:<math> PV \ = \ {A \over r}  </math>

其中'''PV''' = 永续现值，'''A''' = 定期付款金额，'''r''' = 收益率，贴现率或利率<ref>{{Cite news|url=https://corporatefinanceinstitute.com/resources/knowledge/finance/perpetuity/|title=Perpetuity - Definition, Formula, Examples and Guide to Perpetuities|newspaper=Corporate Finance Institute|accessdate=2018-11-14|language=en-US|archive-date=2021-01-24|archive-url=https://web.archive.org/web/20210124122225/https://corporatefinanceinstitute.com/resources/knowledge/finance/perpetuity/|dead-url=no}}</ref>。

== 参考文献 ==
{{reflist}}

[[Category:金融数学]]