Primary Industry Input-output Efficiency of Yangtze Delta Area Based on DEA
The overall efficiency,technical efficiency and scale efficiency of the primary industry were analyzed by DEA model based on the input-output statistics data of the primary industry of 16 cities in Yangtze Delta Area in 2010 from the input angle and the problems of non-DEA effective unit were analyzed from input redundancy and output deficiency angles in the light of projection analysis results of non-DEA effective unit to provide a reference for improving the efficiency of the primary industry and GDP growth in Yangtze Delta Area.The results showed that 9 cities of Shanghai,Suzhou,Wuxi,Nantong,Hangzhou,NingboHuzhou,Zhoushan and Taizhou were in the DEA effective state but 7 cities of Yangzhou,Jiaxing,shaoxing,Changzhou,Taizhou,Nanjing and Zhenjiang were in the non-DEA effective state.The reasons to affect the overall efficiency of 7 cities were invalid scale efficiency and invalid technical efficiency.Shaoxing was in the progressive increase state of scale efficiency with input redundancy and without insufficient output.Zhenjiang was in the state of input redundancy amount and insufficient output amount.Nanjing,Changzhou,Yangzhou,Taizhou and Jiaxing were in the state of input redundancy and insufficient output but 2 cities of Nanjiang and Changzhou were in the progressive increase state of scale efficiency,and 3 cities of Yangzhou,Taizhou and Jiangxing were in the progressive decrease state of scale efficiency.