[1] Renmin Univ China, Sch Appl Econ, 59 Zhongguancun St, Beijing 100872, Peoples R China
[2] Indiana Univ, ONeill Sch Publ & Environm Affairs, 1315 E 10th St, Bloomington, IN 47405 USA
[3] China Energy Investment Corp, 6-9 Fuchengmen North St, Beijing 100034, Peoples R China