The empirical analysis on the relative efficiency of eleven representative steel companies from Chinese A-share Companies by DEA in 2007 showed that the scale benefit of eight companies kept unchanged, the scale benefit of sheet metal in Benxi Steel and Iron Group Company was increasing, while the scale benefit of two companies was decreasing. According to the production theory of three stages in economics, the best production stage is that of the scale benefit decreased. Hence, we conclude that our steel companies in optimal production stage are less than 20% of total samples, while the compa...
