with A representing the constant average and marginal productivity of capital, andKt the aggregate stock of capital. As we saw in Chap. 2, aggregate constant returnsto scale in the cumulative inputs is a necessary condition for endogenous growth.This assumption is a violation of the Inada condition limKt!1 F 0 .Kt / D 0; whichis assumed to hold in neoclassical growth models under decreasing returns to scale