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This article considers that the flow of new not patented innovations is difficult to occur among firms, especially when some inventions are caused by serendipity. Here I develop a model to analyze the conditions for a "market for inventions" to exist. With the help of game theory in particular, I show that the creation of such a market is quite unlikely because unfair buyer's behaviour and the possibility of expropriation of the new innovation renders the seller reluctant to negotiate with adoi:10.4067/s0718-27242008000100004 fatcat:tfefxv5geja6bd524fuupy6esy