The existing researches on agglomeration economy are mainly restricted within an industrial level or regional economy level examination, and there is little analysis of organizational level.

已有的关于集聚经济的研究主要集中在产业水平或者区域经济水平，缺少从组织结构层次的分析。

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That is precisely what we are doing." The National Center on Education and the Economy will be working with eight states on a project to test board examination systems.

VOA: special.2010.02.25

But, an examination of the U.S. economy would find that most of its variability is in capital spending.

FORBES: Yes We Can, But No We Didn't