Mukherjee, Arijit - University <Nottingham> / Department of Economics - 2005
a model with endogenous number of innovatingfirms, we show that whether product patent increases R&D is ambiguous, and … depends onthe type of market demand and the cost of R&D. If the market size increases with numberof firms, product patent … of lower R&D under productpatent. If the market size does not increase with number of firms, product patent …