This paper establishes the relation between APLs and direct input coefficients through Sherman-Morrison formulation.On such a basis,elasticity matrix can be calculated for each element of the APLs matrix,which measure...This paper establishes the relation between APLs and direct input coefficients through Sherman-Morrison formulation.On such a basis,elasticity matrix can be calculated for each element of the APLs matrix,which measures the percentage change in the APLs-matrix element brought by one percentage change in every direct input coefficient.Hence,the percentage change in each APLs-matrix element caused by the real percentage change in each coefficient with other coefficients fixed can be drawn,from which it is easily to find out the APLs-important coefficients and is useful to explain the reason for change in the matrix.The empirical application studies the Chinese economy.What's more,the method is applied under different level of aggregation.The comparison between the APLs matrix of 1997 and 2002 allows the authors to visualize the elements that change dramatically.Then the methodology above is applied to explain the change from the perspective of direct input coefficients and find out the important coefficients to the Chinese APLs matrix.展开更多
We build the influence function empirical model of China's grain production at the present stage in view of the factors influencing direct grain subsidies,using Cobb-Douglas production function model.And we estima...We build the influence function empirical model of China's grain production at the present stage in view of the factors influencing direct grain subsidies,using Cobb-Douglas production function model.And we estimate the elasticity coefficient of impact of China's direct grain subsidies on grain yield,using the panel data pertaining to 29 provinces in the period 2004-2007;comparatively analyze the validity and limitation of policy factors of direct grain subsidies on China's grain yield.The results show that at the present stage,the elasticity coefficient of impact of China's direct grain subsidies on grain yield is 0.002 3,and under the existing subsidy system and level,direct grain subsidies play a positive role in increasing grain yield,but the role is limited;the elasticity coefficient of impact of the food price on grain yield is much larger than that of impact of direct grain subsidies on grain yield.Therefore,the government should strengthen and improve direct grain subsidy policies;in the mean time,pay full attention to the use of market mechanism to consolidate the basic role of the food price in promoting food security to a great extent.展开更多
基金National Natural Science Foundation of China(51008190,50878129)Research Foundation of Selecting and Training Outstanding Young Teachers in Shanghai Universities(sdj10009)+1 种基金Research Foundation of Shanghai Dianji University(10C201)Key Subject Construction Project of Shanghai Dianji University(10XKJ01)
基金supported in part by the National Natural Science Foundation of China under Grant No.70903068
文摘This paper establishes the relation between APLs and direct input coefficients through Sherman-Morrison formulation.On such a basis,elasticity matrix can be calculated for each element of the APLs matrix,which measures the percentage change in the APLs-matrix element brought by one percentage change in every direct input coefficient.Hence,the percentage change in each APLs-matrix element caused by the real percentage change in each coefficient with other coefficients fixed can be drawn,from which it is easily to find out the APLs-important coefficients and is useful to explain the reason for change in the matrix.The empirical application studies the Chinese economy.What's more,the method is applied under different level of aggregation.The comparison between the APLs matrix of 1997 and 2002 allows the authors to visualize the elements that change dramatically.Then the methodology above is applied to explain the change from the perspective of direct input coefficients and find out the important coefficients to the Chinese APLs matrix.
基金Supported by Scientific Research Foundation Project of Southwest University(SWU1109039)Fundamental Research Funds for the Central Universities(SWU1109039)
文摘We build the influence function empirical model of China's grain production at the present stage in view of the factors influencing direct grain subsidies,using Cobb-Douglas production function model.And we estimate the elasticity coefficient of impact of China's direct grain subsidies on grain yield,using the panel data pertaining to 29 provinces in the period 2004-2007;comparatively analyze the validity and limitation of policy factors of direct grain subsidies on China's grain yield.The results show that at the present stage,the elasticity coefficient of impact of China's direct grain subsidies on grain yield is 0.002 3,and under the existing subsidy system and level,direct grain subsidies play a positive role in increasing grain yield,but the role is limited;the elasticity coefficient of impact of the food price on grain yield is much larger than that of impact of direct grain subsidies on grain yield.Therefore,the government should strengthen and improve direct grain subsidy policies;in the mean time,pay full attention to the use of market mechanism to consolidate the basic role of the food price in promoting food security to a great extent.
