Considerable work has been done on chaotic dynamics in the field of economic growth and dynamic macroeconomic models during the last two decades. This book considers numerous new developments: introduction of infrastructure in growth models, heterogeneity of agents, hysteresis systems, overlapping models with pay-as-you-go systems, keynesian approaches with finance considerations, interactions between relaxation cycles and chaotic dynamics, methodological issues, long memory processes and fractals... A volume of contributions which shows the relevance and fruitfulness of non-linear analysis for the explanation of complex dynamics in economic systems.Considerable work has been done on chaotic dynamics in the field of economic growth and dynamic macroeconomic models during the last two decades. This book considers numerous new developments: introduction of infrastructure in growth models, heterogeneity of agents, hysteresis systems, overlapping models with pay-as-you-go systems, keynesian approaches with finance considerations, interactions between relaxation cycles and chaotic dynamics, methodological issues, long memory processes and fractals... A volume of contributions which shows the relevance and fruitfulness of non-linear analysis for the explanation of complex dynamics in economic systems.1: Economic Growth Models.- Infrastructure in an Adaptative Economizing Model of Economic Growth.- Neo-classical Growth and Complex Dynamics: A Note on Days (1982) Model.- 2: Business Cycles.- Hysteresis Arising Prom Individual Inertia and Behavioral Heterogeneity.- Non Linear Dynamics and Utility Functions in Overlapping Generations Models.- Pay-as-You-Go System under Permanent Business Cycle.- 3: Keynesian Models.- Relaxation Cycle Chaotic Dynamics and Limit Cycle: a Model with Keynesian Flavour.- Credit and Financial Markets in Keynes Conception of Endogenous Business Cycles: an Interpretation.- 4: Methodological Issues.- Business Cycles, Chaos and Predictability.-lCš