基金项目: | This research is funded by the Program for New Century Excellent Talents in Chinese Universities (NCET-2009), the Project of the National Natural Science Foundation of China (No. 71272069), the Key Project of the Chinese Ministry of Education (No. 12JJD790003 and No. 2007JJD790127), the Shanghai Social Sciences Project (2010BJB019) and the "985" Project of the State Innovative Institute of Fudan University. See Redding (2010) for a general summary of this literature. |