There are good reasons for this. Poor countries cannot afford social services and old age pensions, and people's incomes are so low they have nothing to spare for savings.

这个问题可以被充分的理由解释。贫穷的国家无法负担起社会公益服务和养老金，并且人们的收入非常低，以至于他们没有钱可以储蓄。