Global Externalities, Endogenous Growth And Sunspot Fluctuations

The authors consider a two-sector economy with Cobb-Douglas technologies, labor-augmenting global external effects and increasing social returns. They prove the existence of a normalized balanced growth path and they give conditions for the occurrence of sunspot fluctuations that are compatible with both types of capital intensity configuration at the private level provided the elasticity of intertemporal substitution in consumption admits intermediary values. They finally show that the existence of period-two cycles requires the consumption good to be physical capital intensive at the private level.