This article analyses the technical and environmental efficiency of hog production in China using data from the China Agricultural Product Cost-Benefit Compilation（NDRC 2005–2013） and the First National Census of P...This article analyses the technical and environmental efficiency of hog production in China using data from the China Agricultural Product Cost-Benefit Compilation（NDRC 2005–2013） and the First National Census of Pollution： Manual of Discharge Coefficient of Livestock and Poultry Industry（IEDA and NIES 2009）. The empirical results show a great variation in environmental efficiency, ranging from 0.344 to 0.973 with a mean value of 0.672 that declines over time. Southwest China is found to be the most environmentally efficient region, while the Northeast and the Northwest are the least efficient. Another finding is that technical and environmental efficiencies are highly correlated in hog production; the most environmentally efficient regions are usually found to have high technical efficiency, and vice versa. In addition, we computed the output elasticities with respect to each factor input. The results show that feed is the most efficient input, with an output elasticity of approximately 0.551, which is much higher than the elasticity of the nitrogen surplus, other capital or labour. The output elasticity with respect to the nitrogen surplus is 0.287 on average. Finally, the scale elasticity in hog production is slightly higher than 1.展开更多
【选注者言:前几年,笔者在《大学英语阅读文选》上曾经读到过一篇文章,其标题是Missing:1000,000 Children a Year。美国每年失踪的儿童如此之多,令人大为震惊！读到本文,略感欣慰,因为有了现代科技的襄助,失踪儿童“失而复得”的情况...【选注者言:前几年,笔者在《大学英语阅读文选》上曾经读到过一篇文章,其标题是Missing:1000,000 Children a Year。美国每年失踪的儿童如此之多,令人大为震惊！读到本文,略感欣慰,因为有了现代科技的襄助,失踪儿童“失而复得”的情况越来越多了。本文有一句话,非常实在: Economists debate whether technology has increased productivity.Sociologistsargue whether instant communication has improved or damaged the quality or life。But technology has had a quantifible(可以计量的)impact in at least one area:itis helping to bring home thousands of missing children。 然而,在阅读本文的过程中,笔者的心依然沉重,因为,本文揭露了美国(一个被世界很多人视作天堂,一个被自诩为“人权王国”的国度)的令人有点毛骨悚然的黑暗现实！】展开更多
基金sponsored by the National Natural Science Foundation of China(71473123,71333008)A Project Funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions,China(PAPD)
文摘This article analyses the technical and environmental efficiency of hog production in China using data from the China Agricultural Product Cost-Benefit Compilation（NDRC 2005–2013） and the First National Census of Pollution： Manual of Discharge Coefficient of Livestock and Poultry Industry（IEDA and NIES 2009）. The empirical results show a great variation in environmental efficiency, ranging from 0.344 to 0.973 with a mean value of 0.672 that declines over time. Southwest China is found to be the most environmentally efficient region, while the Northeast and the Northwest are the least efficient. Another finding is that technical and environmental efficiencies are highly correlated in hog production; the most environmentally efficient regions are usually found to have high technical efficiency, and vice versa. In addition, we computed the output elasticities with respect to each factor input. The results show that feed is the most efficient input, with an output elasticity of approximately 0.551, which is much higher than the elasticity of the nitrogen surplus, other capital or labour. The output elasticity with respect to the nitrogen surplus is 0.287 on average. Finally, the scale elasticity in hog production is slightly higher than 1.
文摘【选注者言:前几年,笔者在《大学英语阅读文选》上曾经读到过一篇文章,其标题是Missing:1000,000 Children a Year。美国每年失踪的儿童如此之多,令人大为震惊！读到本文,略感欣慰,因为有了现代科技的襄助,失踪儿童“失而复得”的情况越来越多了。本文有一句话,非常实在: Economists debate whether technology has increased productivity.Sociologistsargue whether instant communication has improved or damaged the quality or life。But technology has had a quantifible(可以计量的)impact in at least one area:itis helping to bring home thousands of missing children。 然而,在阅读本文的过程中,笔者的心依然沉重,因为,本文揭露了美国(一个被世界很多人视作天堂,一个被自诩为“人权王国”的国度)的令人有点毛骨悚然的黑暗现实！】
