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

耶鲁公开课 - 金融市场课程节选

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

耶鲁公开课 - 金融市场课程节选

As Hanson says, thus arose the kleros, or the idea of a privately held plot attached not to any one person, but rather in perpetuity to a single farm family or oikos.

如汉森所言,kleros兴起了,或是说有了私有土地,而不再属于单个人的观念产生了,也可永久的属于单个的农业家庭或者领主

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You want to subtract off the value of a perpetuity that starts after 2T, six-month intervals, so this is the present value of the perpetuity that starts after 2T, six-month intervals.

所以就要从永续债券价格里减去,2T期以后,每六月一期券息的贴现值,这部分是永久债券从第2T期后,每半年一期券息的现值

耶鲁公开课 - 金融市场课程节选

If you had a perpetuity, which paid C/2 forever, you already know from the perpetuity formula that the value of that would be C/2 divided by r/2 if r/2 is the discount rate.

如果你有一只永续债券,每半年付息C/2,没有到期日,从永续债券的公式可以知道,债券价格等于C/2除以r/2,r/2为贴现率

耶鲁公开课 - 金融市场课程节选