1 Empirical studies of innovation and market structure

authors:Wesley M. Cohen and Richard C. Levin

Handbook of Industrial organization

Volume 2, 1989, Pages 1059-1107

http://www.sciencedirect.com/science/article/B7P5S-4FD79WP-W/2/3222f6d46d5132a54a52d84eefea000b

2 Competition and Innovation: An Inverted-U Relationship

authors:Philippe Aghion, Rachel Griffith ,Peter Howitt 等

the Quarterly Jounal of Economics

May 2005, Vol. 120, No. 2, Pages 701-728

http://www.mitpressjournals.org/doi/abs/10.1162/0033553053970214

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