those economists did not consider the fact
所有跟贴·加跟贴·新语丝读书论坛
送交者: requestor 于 2006-12-02, 11:53:32:
回答: Some economists said, as long as US productivity inceases 由 JZ 于 2006-12-02, 11:29:47:
population structure changes, people are living longer and longer, and there are fewer working people to support them, it need to be changed from pay as you go to a saving based system.
所有跟贴:
加跟贴