Environmental Regulation and Innovation: A Panel Data Study
利用制造业面板数据，发现滞后的环境合规支出对研发支出有显著正向影响，但专利产出与合规成本关系不大，检验了波特假说。
In a 1991 essay in Scientific American, Michael Porter suggested that environmental regulation may have a positive effect on the performance of domestic firms relative to their foreign competitors by stimulating domestic innovation. We examine the stylized facts regarding environmental expenditures and innovation in a panel of manufacturing industries. We find that lagged environmental compliance expenditures have a significant positive effect on R&D expenditures when we control for unobserved industry-specific effects. We find little evidence, however, that industries' inventive output (as measured by successful patent applications) is related to compliance costs. © 1997 by the President and Fellows of Harvard College and the Massachusetts Institute of Technology