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Patents, Trade Secrets and the Correlation Among R&D Projects
The this examines competition between multiple firms to secure patents. When there are multiple intellectual property rights protection instruments, the authors find that the paths chosen in an R&D race can move towards the social optimum.
Link
http://www.card.iastate.edu/faculty/profiles/giancarlo_moschini/Bulut-Moschini-EL-2006.pdf