Our analysis provides a rationale for the existence of a positive fixed-fee and output royalty in the licensing contracts. In this article, we show that the preference functions play an important role in this respect. As the market expansion effect gets weaker, it reduces the possibility of a...

It is usually believed that innovation increases profits of the firms and alsosocial welfare. In a duopoly model with product innovation, we show that both thesebelieve may go wrong. We show that if the cost of innovation is not very large,prisoner’s dilemma occurs under product innovation,...