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3 全国预拌砼产量的发展趋势预测基于以上分析可知 ,要预测全国预拌砼产量发展趋势 ,需预测全国的投资、人均GDP、产业GDP结构等基础数据。3 1 基础数据预测3 1 1 全国投资总量预测1 )GDP定基弹性系数变动情况 笔者分析了1 988年后投资GDP的弹性系数变动情况 ,如图 6。到
3 Prediction of Development Trend of Ready-mixed Concrete Production in China Based on the above analysis, we can see that in order to predict the development trend of ready-mixed concrete production in China, it is necessary to predict the basic data such as national investment, GDP per capita and industrial GDP structure. 3 1 BASIC DATA PREDICTION 3 1 1 Forecast of the Total Investment in the Country 1) Changes in the GDP-based Elasticity Coefficient The author analyzes the changes in the elasticity coefficient of investment in GDP after 1989, as shown in Figure 6. To