| Strengthening the investment and construction of urban infrastructure can effectively promote the construction of urbanization,so as to achieve regional economic growth and people's life prosperity.However,while the scale of urban infrastructure investment is gradually increasing,due to the lack of long-term overall planning in some areas of China,there are gradually reckless investment,repeated construction,waste of resources,unbalanced regional development and other phenomena.These unreasonable infrastructure investment decisions will not only lead to low efficiency and waste of resources,but also may hinder urban development and even lead to thorny social problems.Therefore,the reasonable evaluation of urban infrastructure investment efficiency is of great significance to the realization of the effectiveness of infrastructure investment decision-making.However,although there are many studies trying to evaluate the development level of urban infrastructure system in China,most of them neglect the stage characteristics of infrastructure,so it is difficult to analyze which link has problems in the case of low investment efficiency,and it is difficult to take accurate strategies to improve efficiency.Based on the stage characteristics of urban infrastructure,this paper evaluates the investment efficiency of urban infrastructure in China.Firstly,by combing the research background and related research status of urban infrastructure investment efficiency,the shortcomings of previous research are clarified,so as to build the overall research framework of this paper.Secondly,considering that urban infrastructure can be divided into two stages: construction and operation,through the systematic sorting of relevant literature and considering the availability of data,the evaluation index system of urban infrastructure investment efficiency is finally determined after the indicators are collected and screened.Furthermore,based on the evaluation index system and the shortcomings of the classic DEA model,a two-stage network DEA model and Malmquist index model are constructed.Finally,based on the data of 70 large and medium-sized cities in China from 2010 to 2017,this paper makes an empirical analysis.On the one hand,using the two-stage network DEA model to analyze the overall and phased characteristics of urban infrastructure investment efficiency from a static perspective;on the other hand,using Malmquist index model to analyze the dynamic changes of urban infrastructure investment efficiency.The results show that :(1)From the perspective of static analysis,the overall level of urban infrastructure investment efficiency in China is not high,and there are great differences in infrastructure investment efficiency among inefficient cities.In the stage characteristics,although the efficiency of construction stage has not reached the effective state,it has been at a high level.The poor efficiency of operation stage is the main reason for the low overall efficiency.The urban infrastructure shows the phenomenon of "Emphasizing construction but neglecting operation".(2)From the perspective of urban category and regional efficiency,whether it is overall efficiency or staged efficiency,the investment efficiency in the first-tier cities is much higher than that in other categories of cities.The efficiency of urban infrastructure investment shows a state of “High in the east and low in the middle and west”geographically,which is basically consistent with the economic development of the region.(3)From the perspective of dynamic analysis,the overall efficiency of infrastructure investment in China is on the rise,mainly due to the joint improvement of technical efficiency and technological progress efficiency,in which technological progress plays a key role.From the perspective of stage,the growth of overall efficiency mainly comes from the common growth of construction stage and operation stage,and the driving effect of efficiency growth in operation stage is the most obvious. |
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