年金( annuity) (一)概念:年金是指等期、定额的系列 收支 a stream or series of equal payments to be received in the future The payments are assumed to be received at the end of each period a good example of an annuity is a lottery, where the winner is paid over a number of years 二)分类: 1、普通年金2、即付年金 3、递延年金4、永续年金年金（annuity） （一）概念：年金是指等期、定额的系列 收支. – a stream or series of equal payments to be received in the future The payments are assumed to be received at the end of each period. A good example of an annuity is a lottery, where the winner is paid over a number of years. （二）分类： 1、普通年金2、即付年金 3、递延年金4、永续年金