投资需求是社会总需求的一个重要组成部分，投资的变化对国民经济发展态势具有特别重要的影响。８０年代以采，我国投资的年均增长速度达到２０％左右，明显快于国内生产总值的增长，固定资产投资率则从１９８０年的２０％提高到１９９８年的近３６％，上升了大约１６个百分点 Investment demand is an important part of the total social demand. Changes in investment have a particularly important impact on the development of the national economy. In the 1980s, the average annual growth rate of China’s investment reached about 20%, significantly faster than the growth of the GDP. The investment rate of fixed assets increased from 20% in 1980 to nearly 36% in 1998, rising by about 16 percentage points