Calculating Investment Efficiency of Chinese Energy Enterprises by DEA Method

Investment efficiency reflects the debt paying ability, profitability and sustainability of enterprises, is a guide to development direction Chinese energy enterprises. ratio value effective benefits generated by investment behavior firm related expenditures, which degree firm's use materials.Fisher, Modigliani Miller consider business activities as continuation activities. Therefore, corporate equivalent production in economics, efficiency. There are many factors that affect investment, studying efficiency, these influences can be assessed. For example, Song Liying, Li Liqing An Tongliang Czarnitzki D, Hu Wenjun evaluated effect government subsidies through Tian Yu, Zhang Tongbin tax policy DEA method widely used internationally measure It was proposed Charnes, Cooper Rhodes promoted Banker et al. Fare.The approach relies on observed data decision unit calculate input-output determine frontier. In this paper, companies studied using lay foundation for evaluation policies.