Long cycles in a modified Solow growth model

In this paper we analyze the dynamics of the Solow growth model with a generic production function. For this purpose, we consider that the labor growth rate, $$L^{\prime }(t)/L(t)$$ L ′ ( t ) / L ( t ) , is a $$T$$ T -periodic function, for a fixed positive real number $$T$$ T . We obtain the closed form solutions for the fundamental Solow equation with the new description of $$L(t)$$ L ( t ) , using a Cobb–Douglas production function. Using notions of the qualitative theory of ordinary differential equations and nonlinear functional analysis, we prove that there exists a $$T$$ T -periodic solution for the Solow equation with a generic production function. From the macroeconomic point of view this is a refined Solow model, which exhibits a smooth cyclic behavior in the economy with long period and relatively small amplitude. Copyright Springer-Verlag Berlin Heidelberg 2015