有些经济学家指出，美国的私人储蓄率太低。政府应当采取某种措施来使它上升。什么政策有可能用来达

到这个目标？如何能达到这个目标？为什么？ Some economists have argued that the U．S．private saving rate is too low and that the government should adopt some measures to increase it．What type of policies might achieve this end，howand why？