从宏观经济的总需求构成来看,投资、消费、净流出三大需求是拉动经济增长的强大动力,通常被称为“三驾马车”。“三驾马车”对不同的国家、不同地区和处于不同经济发展阶段经济增长的拉动效果有所不同。当前,随着美国金融危机的不断蔓延,全球实体经济增速回落以及全国外部需求 Judging from the composition of the total demand in the macroeconomy, the three major demands of investment, consumption and net outflow are the driving forces driving economic growth. They are commonly referred to as the “troika.” The “troika” has different effects on economic growth in different countries, regions and at different stages of economic development. At present, with the continuous spread of the financial crisis in the United States, the real growth of the global economy has dropped and the external demand of the country