All Rights Reserved
AccessEcon LLC 2006, 2008.
Powered by MinhViet JSC

 





Defu Li
School of Economics and management, Tongji University
 
Shanghai, 200092
China
 
tjldf@tongji.edu.cn
 
 
 
 
 
 
JEL Areas:
O3 : Technological Change; Research and Development: General
O4 : Economic Growth and Aggregate Productivity: General