On expectations-driven business cycles in economies with production externalities

Expectations-driven business cycles are defined as positive co-movement between consumption, investment and hours that result from a change in expectations, holding constant technology, preferences and government intervention. This note explores the possibility of expectations-driven business cycles in business cycle models with external effects. It is found that in one-sector models conditions for expectations-driven business cycles and conditions for multiple equilibria are tightly connected. In two-sector models those conditions appear to be mutually exclusive.