These authors focus primarily on differences in the legal systems and strength of legal enforcement across different countries, although their intuition and model is motivated at the firm level.
尽管他们的直觉和模型都来自于企业层面，这些作者首先关注的是国家之间法律系统和执法力度上的差别。
These findings are consistent with previous empirical studies based on firm-level data, and call for further theoretical explanations.
这些发现与先前的基于企业层面数据的实证研究相一致，需要更进一步的理论解释。
Thus, as we review in greater detail in the next section, firm-level and industry-level studies do not provide an empirical foundation for subsidizing SMEs.
因此，当我们在下一节更详细地进行分析的时候，公司级和行业级的研究都没有为给中小企进行补贴提供以经验为根据的基础。
On this question, extant researches often focus on macro and middle perspectives such as institution system and industry, rarely on micro firm-level perspective.
在这一问题上，现有的研究多取体制、产业等宏观和中观角度，面向企业微观层面的研究相对较少。
On this question, extant researches often focus on macro and middle perspectives such as institution system and industry, rarely on micro firm-level perspective.
在这一问题上，现有的研究多取体制、产业等宏观和中观角度，面向企业微观层面的研究相对较少。
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