| A study on elasticity of import & export (I & E) is of great theoretical and realistic significance for governments and enterprises to correctly make macro and micro policies. In this thesis, abundant statistical data are contained, two methods are employed to give a positive analysis on the elasticity of demand (eod) of I & E in China during the period from 1990 to 2001 from the following three aspects: Firstly, regression analysis is applied to calculate the average eod of the general I & E. Generally speaking, the export is rich in price eod while the import has a poor one. In addition, the absolute value of the sum of these two kinds of elasticity is higher than 1, which accords with Marshall-Lener Condition and proves that devaluation of RMB should be helpful to improve the trade balance. Suggestion is further provided such as cutting off producing cost of export, improving technology and implementing strategy of import substitution to improve trade balance. Secondly, by use of the elasticity's definition, general elasticity for some 100 kinds of major export and 50 kinds of import is calculated year after year. A further analysis of the calculations proves the previous conclusion. Thirdly, elasticity approach is also employed to calculate the price eod of 8 kinds goods which belong to 5 categories such as agriculture products, coal, steel, vehicles, medicines, etc. Then, in realistic economic situation, corresponding policies concerned with exchange rate, price and industry are provided according to different distributions.
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