Template-Type: ReDIF-Paper 1.0 Author-Name: Tiziana Assenza Author-X-Name-First: Tiziana Author-X-Name-Last: Assenza Author-Email: tiziana.assenza@unicatt.it Author-Workplace-Name: Dipartimento di Economia e Finanza, Università Cattolica del Sacro Cuore Author-Name: William Brock Author-X-Name-First: William Author-X-Name-Last: Brock Author-Email: wbrock@ssc.wisc.edu Author-Workplace-Name: Economics Department,University of Winsconsin, Madison Author-Name: Cars Hommes Author-X-Name-First: Cars Author-X-Name-Last: Hommes Author-Email: C.H.Hommes@uva.nl Author-Workplace-Name: CeNDEF,University of Amsterdam Title: Animal Spirits, Heterogeneous Expectations and the Emergence of Booms and Busts Abstract: We introduce a simple equilibrium model of a market for loans, where households lend to firms based on heterogeneous expectations about their loan default probability. Agents select among heterogeneous expectation rules, based upon their relative performance. A small fraction of pessimistic traders already has a large aggregate effect, leading to a crisis characterized by high contract rates for loans and low output. Our stylized model illustrates how animal spirits and heterogeneous expectations amplify boom and bust cycles and how endogenous coordination on pessimistic expectations amplifies crises and slows down recovery. Taking heterogeneous expectations and bounded rationality into account is crucial for the timing of monetary or fiscal policy. Length: 37 Creation-Date: 2013-12 File-URL: http://dipartimenti.unicatt.it/economia-finanza-def0007.pdf File-Format: Application/pdf File-Function: First version, 2013 Number: def0007 Classification-JEL: E32 D83 D84 Keywords: Heterogeneous Expectations, Crises, Animal Spirits. Handle: RePEc:ctc:serie1:def0007