If you offer life insurance, you have life tables which give you probabilities of dying at various ages, but that's for the general population.

如果你提供人寿险,你会找张寿命表,告诉你各个年龄段的死亡率,但那是针对普通人群的

耶鲁公开课 - 金融市场课程节选

This has made it very clear that there has to be -if you announce anything you have to announce it all at once on a certain date and you can't have favored people that you give the announcement to.

很明显的一点...,如果要宣布事项,就要选定某一天,而且,你宣布的消息,不能只针对某一人群

耶鲁公开课 - 金融市场课程节选