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英文文献：Agglomeration and Spatial Dependence in Certified Organic Operations in the United States-在美国认证有机经营中的集聚和空间依赖
英文文献作者：Marasteanu, I. Julia,Jaenicke, Edward C.
英文文献摘要：
The purpose of this paper to provide added insight into clustering as it pertains to the United States organic sector. I identify clusters of United States certified organic operations by showing how a formal definition of spatial clusters can emerge from an estimated model that accounts for spatial dependency. I also analyze how county-level variables impact the distribution of certified organic operations while controlling for spatial autocorrelation. My results indicate that the spatial distribution of certified organic operations displays statistically significant spatial autocorrelation as well as spatial heterogeneity. The results also indicate that county-level factors related to policy, economics, demographics, and land assets impact the distribution of certified organic operations. As research on firm and industry agglomeration, in general, typically finds that clustering benefits economic development, the results of this paper provide motivation for further research on the formation and impact of clustering in the U.S. organic sector.
本文的目的是提供额外的洞察集群，因为它涉及到美国的有机部门。我通过展示空间集群的正式定义如何从解释空间依赖性的估计模型中产生来确定美国认证的有机操作集群。我还分析了县级变量如何影响认证有机操作的分布，同时控制空间自相关。我的研究结果表明，经认证的有机操作的空间分布在统计学上显示出显著的空间自相关性和空间异质性。结果还表明，与政策、经济、人口统计和土地资产相关的县级因素也会影响认证有机经营的分布。由于对企业和产业集聚的研究一般都发现集群有利于经济发展，因此本文的研究结果为进一步研究美国有机产业集群的形成及其影响提供了动力。
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