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Economic level could be an important factor which influences energy efficiency and it's generally accepted that high level of economic development can lead of high energy efficiency. However, the situation may be different when economic factor is put aside. In the paper, nine regions in China are chosen to compare their energy efficiency at similar economic level between 1995 and 2007. Based on the result, the nine regions can be divided into three categories--early developed regions with lowdoi:10.5539/jsd.v3n4p97 fatcat:mogsbmv7ffculgtcogriwkiru4