We report econometric results concerning the diffusion of detachable chairlifts in the United States that provide the first empirical evidence that the adoption of a technological innovation by a firm decreases the likelihood that a local competitor will also adopt it. We model the effect that an innovation in service speed has on a f's incentive to differentiate the quality of its service from that of its competitors. In our model, the incentive to adopt is negatively related to the number of competitors who have already adopted. Our empirical results support this hypothesis.