We present a model where firms make competitive decisions about the optimal duration (or time to build) of their R&D projects. Choosing its project’s duration, the firm can choose to become a leader or a follower, based on its R&D efficiency, the size of the R&D to be carried out and the...

This paper studies R&D investment decisions of a firm facing the threat of new technology entry and subject to technical uncertainty. We distinguish four scenarios: inevitable entry, entry deterrence, entry blockade, and non-credible entry threat. The entry threat stimulates the incumbent to...