When a Loser Gains: Free Riding in the Innovation of Network Goods

We consider duopolists innovating and producing a good subject to network externalities. If successful in R&D, a firm sells both the old product and the new one. The new product increases the utility of its user; it also generates a higher network externality than does the old product. A firm which fails to innovate nevertheless profits from the success of the rival: the network effect raises the value of the old product it still produces. A firm free-rides on the innovative efforts of another firm, reducing the incentives of any firm to innovate.