The classical economic theory emphasis productive capital accumulation and economic growth's relations,emphasize the productive capital accumulation and work investment increase to the economic growth dynamic action. Although the economists proposed in the future development's orientation many economic growth's theories,the opinion varies,however,the very few some people obtain from economic growth's behind,explanation economic growth basic reason. Therefore,this article embarks from economic growth's behind theory,the elaboration deposit,the investment,the government and the technology advancement to economic growth's function,and proposed two fundamental points: First,economy whether to obtain the growth,is decided ability which will change in the national tends to the future; Second,economic growth's essential reason,is decided by the technology advancement. The paper take the Robert · Solow（Robert Merton Solow） the economic growth theory as a frame,take the American economic phenomena as the reference,behind the elaboration economic growth theory.%经典的经济理论强调生产资本积累与经济增长的关系,强调生产资本积累和劳动投入的增加对经济增长的动力作用.尽管经济学家们在未来发展的取向上提出了诸多经济增长的理论,见解不一,然而很少有人从经济增长的背后入手,解释经济增长的根本原因.为此,本文从经济增长的背后理论出发,论述储蓄、投资、政府与技术进步对经济增长的作用,并提出了两个基本点:其一,经济是否获得增长,取决于国民改变未来趋向的能力;其二,经济增长的关键原因,取决于技术进步.论文以罗伯特·索洛(Robert Merton Solow)经济增长理论为框架,以美国经济现象为参照,阐述经济增长背后的理论.
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