We introduce infrastructure as a cost-reducing technology in Romer's (1987) model of endogenous growth. We show that infrastructure can promote specialization and long-run growth, even though its reflects on the latter is non-monotonic, reflecting its resource costs. We provide evidence using...

We use a model of endogenous growth with vertical innovations, in order to derive optimal energy policy under uncertainty. Innovation can be directed to dirty, green, or nuclear technologies, which in turn can be used to produce different types of energy. We show that, nuclear energy usage, is...