How does firm entry affect innovation incentives and productivity growth in incumbent firms? Micro-data suggests that … sectors which differ by their distance to the technological frontier. We show that entry threat spurs innovation incentives in … technologically advanced sectors - successful innovation allows incumbents to prevent entry. In laggard sectors it discourages …

innovation distinguishing between "dirty" (internal combustion engine) and "clean" (e.g. electric and hybrid) patents across 80 … tax-inclusive fuel prices. Furthermore, there is path dependence in the type of innovation both from aggregate spillovers … and from the firm's own innovation history. Using our model we simulate the increases in carbon taxes needed to allow …