Adoption is Not Development: First Mover Advantages in the Diffusion of New Technology

The diffusion of new technology among competing firms is of long-standing interest in industrial organization. There is an extensive theoretical literature on technology adoption in which firms can instantaneously deploy a new technology in the market at a cost that is exogenously falling over time. While such models explain diffusion (firms adopt asynchronously), Fudenberg and Tirole (1985) show that the incentives to preemptively adopt in sub-game perfect equilibria can cause rents to be equalized across firms. In contrast, we study technology development where costly and time consuming effort is required to deploy a new technology. With diminishing returns to instantaneous effort, delaying deployment reduces the firm's cost, as in adoption models. However, the incentive to preempt is lower: with its development already partially complete, a preempted firm delays deployment less than with adoption. We provide reasonable conditions under which the sub-game perfect equilibrium outcome corresponds that in the pre-commitment equilibrium first proposed by Reinganum (1981a, 1981b), yielding both diffusion and first mover advantages for the case of technology development.