Patenting and licensing are introduced into the lab-equipment horizontal innovation model of endogenous growth. Patent length is not deterministic, in that patent holders' market power will collapse if and only if their patented goods get successfully imitated. The model is solved in an exact...

We present an analytical solution to the lab-equipment R&D growth model with an exogenous rate of imitation and apply it to study the optimal level of intellectual property rights (IPR) protection. This has already been studied in Kwan and Lai (2003); however, a mistake in writing out the...