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为了完善利用公路建设投资乘数计算公路投资对国民经济拉动效益的方法,针对目前利用凯恩斯乘数与投入产出法计算公路建设投资效益的不足,通过公路建设过程中投资乘数作用引起国民经济成倍增长的机理分析,提出从投资乘数的原始定义出发计算公路建设投资乘数的原理,推导了计算公路投资乘数时公路建设投资引起的边际消费的改进算法,并通过京石高速公路有关资料验证了该方法的效果;发展了基于投资乘数计算原理、现有公路工程投资测算、投入产出矩阵组合基础之上的应用方法,克服了常用算法用全社会的消费倾向代替公路投资消费倾向的不足。
In order to improve the method to calculate the investment benefit of highway investment on the national economy by using the investment multiplication factor of highway construction, in view of the shortcomings of using the Keynesian multiplier and input-output method to calculate the investment efficiency of highway construction at present, the national economy is caused by the investment multiplier in the highway construction This paper puts forward the principle of calculating the investment multiplier of highway construction from the original definition of investment multiplier and deduces the improved algorithm of marginal consumption caused by highway construction investment when calculating highway investment multiplier. Relevant data verify the effectiveness of the method; developed based on the principle of investment multiplier calculation, the existing highway engineering investment measurement, input and output matrix combination based on the application method, to overcome the common algorithm with the whole society instead of highway investment propensity to invest The lack of propensity to consume.