Department of Economics
University of Cologne
Institutional Affiliation: University of Cologne
NBER Working Papers and Publications
|February 2013||Patent Rights, Product Market Reforms, and Innovation|
with Philippe Aghion, Peter Howitt: w18854
Can patent protection and product market competition complement each other in enhancing incentives to innovate? In this paper, we address this question by investigating how innovation responses to a substantial policy initiative increasing product market competition interact with the strength of patent rights. We provide empirical evidence of innovation responding positively to the product market reform in industries of countries where patent rights are strong, not where these are weak. The positive response to the reform is more pronounced in industries in which innovators rely more on patenting than in other industries, and in which the scope for deterring entry through patenting is not too large. Our empirical findings are in line with step-by-step innovation models predicting that prod...
Published: Philippe Aghion & Peter Howitt & Susanne Prantl, 2015. "Patent rights, product market reforms, and innovation," Journal of Economic Growth, Springer, vol. 20(3), pages 223-262, September. citation courtesy of
|February 2006||The Effects of Entry on Incumbent Innovation and Productivity|
with Philippe Aghion, Richard Blundell, Rachel Griffith, Peter Howitt: w12027
How does firm entry affect innovation incentives and productivity growth in incumbent firms? Micro-data suggests that there is heterogeneity across industries--incumbents in technologically advanced industries react positively to foreign firm entry, but not in laggard industries. To explain this pattern, we introduce entry into a Schumpeterian growth model with multiple sectors which differ by their distance to the technological frontier. We show that technologically advanced entry threat spurs innovation incentives in sectors close to the technological frontier--successful innovation allows incumbents to prevent entry. In laggard sectors it discourages innovation--increased entry threat reduces incumbents' expected rents from innovating. We find that the empirical patterns hold using rich...
Published: Philippe Aghion & Richard Blundell & Rachel Griffith & Peter Howitt & Susanne Prantl, 2009. "The Effects of Entry on Incumbent Innovation and Productivity," The Review of Economics and Statistics, MIT Press, vol. 91(1), pages 20-32, October. citation courtesy of