A weak version of the Porter hypothesis claims that strict environmental policy provides positive innovation incentives, hence triggering improved competitiveness and securing environmental quality. In a comparative way, this paper empirically tests this hypothesis across countries by linking...

This paper uses patent data to assess policy factors (domestic and international) for patenting activity in automotive emission control technologies. Particular attention is paid to the role of different policy types and fuel prices on both post-combustion and integrated abatement technologies....