The comparative study on the Public Private Partnership and efficiency in urban environmental management

由于亚洲发展中国家的快速城市化和财政困难，政府和社会资本参与的重要性日益凸显。PPP不仅有助于筹集资金，还有助于提高管理机构的效率。本研究旨在比较公共和私人水资源管理的效率。首先，采用DEA方法对亚太地区42家自来水公司的效率进行了评价。在DEA中，公司的效率在1到0之间进行评价。本文试图利用Tobit回归模型探讨效率与社会经济因素之间的关系。结果表明，服务契约提高了企业的效率。然而，PPP并不总是能提高公司的效率。其次，本研究试图厘清公私参与法律制度的发展，并利用DEA对中国35家供水企业的效率进行评估。但是，上市公司和PPP公司在效率上存在统计学差异。

Because of the rapid urbanization and financial difficulties in Asian developing countries, Public-Private-Participation is getting important year by year. PPP is expected not only to contribute for fund raising, but also to improve the efficiency of the management body. This study aims to compare the efficiency of publicly and privately water management.First of all, we evaluate efficiency of 42 water companies in Asia and Pacific region by using DEA. In DEA, company's efficiency was evaluated between 1 to 0. And this study try to investigate the relationship between efficiency and social economic factors by using Tobit regression model. The results show that service contracts improve efficiency of the company. However, PPP does not always improve the efficiency of the company.Second, this study tried to make clarify development of the legal system about Public-Private Participation, and evaluate efficiency of 35 water supply companies by using DEA in China. However, there is statistical difference about efficiency between public companies and PPP companies.