In this manuscript, we relate regional structural composition—related and unrelated variety—to firm-level productivity in European regions, applying a Cobb–Douglas production function framework and using firm-, industry- and regional-level mixed hierarchical (multilevel) models. Our analyses indicate that regional-related variety has a positive impact on firm productivity in European regions, especially for firms in high-tech and medium-tech regions. These outcomes have implications for European policies on competitiveness as firms embedded in regions without these technological and institutional circumstances are systematically worse off in terms of productivity, and catching-up is not obvious for such regional economies.

中文翻译：

---

异构关联和公司生产力

在本手稿中，我们应用Cobb–Douglas生产函数框架并使用公司，行业和地区级别的混合层次结构（多级）模型，将区域结构组成（相关和不相关的品种）与欧洲地区的公司级别生产率联系起来。我们的分析表明，与地区相关的品种对欧洲地区的公司生产率具有积极影响，特别是对高科技和中型高科技领域的公司。这些结果对欧洲的竞争力政策产生了影响，因为那些没有技术和制度条件的地区企业在生产率方面会系统地恶化，而这种地区经济的追赶并不明显。