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Factors Affecting the Power of Patent Rights
The authors identify three policy instruments governments have at their disposal to affect the power of patent rights to prevent imitation. They develop a simple framework to analyse the effects of changing these policy instruments on ex ante investment in invention in the light of recent concerns about the potential effects of socially undesirable patents.
Link
http://www.ecom.unimelb.edu.au/iaesrwww/wp/wp2004n31.pdf