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英文文献：The Role Of Environmental Regulation On Concentrations Of U.S. Livestock Sectors-环境监管对美国畜牧业集中化的作用
英文文献作者：Isik, Murat
英文文献摘要：
The industrialization of U.S. beef, dairy, hog, and poultry sectors has received considerable attention. There have been regional shifts in the geographical location of livestock inventories and livestock farms. This paper examines the trends in geographical concentrations of livestock sectors in the U.S., and determines whether the environmental regulations have impacted the geographical concentrations. It uses an entropy-based geographical concentration measure to determine the extent of concentrations of beef, dairy, hog, and poultry inventories and farms. The results show that livestock productions on a national level and within states are becoming more geographically concentrated. The geographical concentration of livestock sectors is negatively related to the stringency of state environmental regulations.
美国牛肉、乳制品、生猪和家禽行业的工业化已经受到相当大的关注。牲畜盘存和牲畜农场的地理位置出现了区域变化。本文考察了美国畜牧业的地理集中趋势，并确定了环境法规是否影响了地理集中。它使用基于熵的地理集中度测量来确定牛肉、乳制品、猪和家禽库存和农场的集中度。结果表明，国家一级和州内的畜牧业生产在地理上正变得更加集中。畜牧业的地理集中度与国家环境法规的严格程度呈负相关。
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