| In recent years, with the integration of information technology and communication technology, a new concept——information and communication technology appeared, that is, ICT. Because of its great role in the growth of the global economy and the elimination of the "digital divide", ICT industry has been the preferential developmental industry of each country to seize the commanding point of the new round of economic growth. Especially, in China, because of the urgent needs to transform the economic growth mode to promote a new round of economic growth, the prominent role of ICT industry is becoming more and more obvious, and it has been ranked as basic, leading and pillar industry to develop. Therefore, it is necessary and urgent to quantize the operational efficiency of ICT industry and its contribution to the national economy, to research its contribution mechanism and sustainability, and to put forward the development strategy. This is the very theme of the paper.This paper is divided into seven chapters.Chapter 1:Introduction. Firstly, the paper summarizes the influence of ICT and its role in the economic development. And then, ICT is defined according to the rule of the State Statistical Bureau. Finally, the research orientation, framework and innovation of this paper are raised through comments of the domestic and international researches.Chapter 2:Theoretical basis of the contribution of ICT to the national economy. The main research methods of this paper include Data Envelopment Analysis (DEA), Econometrics, Input-output method and System Dynamics approach. The main task of this chapter is to make detailed descriptions to the several methods mentioned above.Chapter 3:Calculation of the contribution ratio of ICT industry to the national economy from the measurement perspective. Based on the Cobb-Douglas function of Econometrics, the capital elasticity and labor elasticity of ICT industry as well as its comprehensive technical levels in both cases of constant returns to scale and non-constant returns to scale are calculated in this chapter. And with the Solow Complementary method, the contribution proportion of technology, capital and labor in ICT industry to output value added are measured.Chapter 4:Analysis of efficiency of China's ICT industry based on DEA. With DEA, the economic efficiency of China's ICT industry in 2003-2008 (recent) is calculated, analyzed and evaluated; the economic efficiency of China's ICT industry in 1995-2008 (long term) is calculated, analyzed and evaluated; changes of total factor productivity, technical efficiency and technology of provincial ICT industry in china between 2003 and 2008 are calculated, analyzed and evaluated as well.Chapter 5:Calculation on contribution of ICT to national economy with the input-output method. Based on the input-output method, it is analyzed and calculated quantitatively that the direct consumption, fully consumed, fully demand, direct allocation, completely distributive and complete supply of ICT to other departments, the promotion effect of ICT industry to the national economy, the impact of the driving effect of ICT to the composition of the total investment, and the impact of telecommunications industry to the composition of the aggregate output.Chapter 6:Prediction research on the sustainability of the contribution of ICT based on System Dynamics. Firstly, the modeling procedures and flow graph structure of the model are presented, and causality of the model is illustrated as well, which leads to the model simulation and control analysis. The paper analyzes 5 sub-system simulation results and compared the effects of the changes in exogenous variables on the 5 sub-system during the period of 2003 to 2020.Chapter 7:Summary. Summarize the full text and put forward suggestions. And the limitations of the paper are pointed out as well.
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