A Research On The Efficiency Of China’s Coal Listed Companies Based On Negative Data In DEA

The coal industry is Chinese energy pillar industry,in recent years,various coal enterprises are facing the imbalance between supply and demand,coal prices,coal market is facing "cold winter " after the "golden ten years",these are due to the expansion of new coal enterprises.The state has introduced a series of policy:supply-side reform,the coal enterprises to cut excessive industrial capacity.Coal enterprises are facing serious problems,eager to improve the existing problems of low efficiency,as well as to find a new path of development.Based on the above problems,the following research work is carried out in this paper:(1)The validity analysis of traditional DEA model is extended to the generalized DEA model,verified after the data translation of the generalized BCC model,the validity of decision making units is unchanged,given the data scale rationality conditions,Thus it provides theoretical support for the evaluation of the efficiency of coal enterprises by the generalized DEA model.(2)This paper selects 29 coal listed enterprises in China from2009 to2015 as the research object,selects the appropriate input and output indicators,from the overall situation,according to scale and each enterprise to the enterprise scale,analysis their efficiency,the improved projection value is also given.(3)In this paper,the Malmquist index method is used to analyze the dynamic efficiency of 29 coal listed companies in China during the period of 2009-2015,and the changes of total factor productivity index,comprehensive technical efficiency index and technological progress index are evaluated.(4)In this paper,Tobit linear regression analysis method is used to analyze the influencing factors of comprehensive efficiency of Chinese coal listed companies.The empirical results show that:①in recent years,enterprises comprehensive efficiency and pure technical efficiency of the coal listed companies are showing a downward trend;② the efficiency of coal enterprises of small scale enterprises is superior to other scale enterprises;③the total factor productivity of coal listed companies is decreasing,and the trend of technological progress index is the same;④analysis of factors affecting efficiency shows that there is a significant negative correlation between the level of grassroots employees,ownership concentration,the rate of assets and liabilities and the comprehensive efficiency of enterprises,the total assets turnover rate and the comprehensive efficiency of enterprises have a significant positive correlation,the total asset turnover ratio and enterprise efficiency has a significant positive correlation.At last,the paper puts forward some policy suggestions to improve the efficiency of coal listed companies in China,pointed out the deficiencies in the study and future research prospects.