Summary
A simple nonlinear structural model of endogenous belief heterogeneity is proposed. News about fundamentals is an IID random process, but nevertheless volatility clustering occurs as an endogenous phenomenon caused by the interaction between different types of traders, fundamentalists and technical analysts. The belief types are driven by adaptive, evolutionary dynamics according to the success of the prediction strategies as measured by accumulated realized profits, conditioned upon price deviations from the rational expectations fundamental price. Asset prices switch irregularly between two different regimes — periods of small price fluctuations and periods of large price changes triggered by random news and reinforced by technical trading — thus, creating time varying volatility similar to that observed in real financial data.
Earlier versions of this paper were presented at the 27th annual meeting of the EFA, August 23–26, 2000, London Business School, the International Workshop on Financial Statistics, July 5–8, 1999, University of Hong Kong, the Workshop on Expectational and Learning Dynamics in Financial Markets, University of Technology, Sydney, December 13–14, 1999, the Workshop on Economic Dynamics, January 13–15, 2000, University of Amsterdam, and the workshop Beyond Efficiency and Equilibrium, May 18–20, 2000 at the Santa Fe Institute. We thank participants of all workshops for stimulating discussions. Special thanks are due to Arnoud Boot, Peter Boswijk, Buz Brock, Carl Chiarella, Dee Dechert, Engelbert Dockner, Doyne Farmer, Gerwin Griffioen, Alan Kirman, Blake LeBaron, Thomas Lux, Ulrich Müller, and Josef Zechner. Detailed comments by two anonymous referees have led to several improvements. We also would like to thank Roy van der Weide and Sebastiano Manzan for their assistance with the numerical simulations. This research was supported by the Austrian Science Foundation (FWF) under grant SFB#010 (“Adaptive Information Systems and Modelling in Economics and Management Science.”) and by the Netherlands Organization for Scientific Research (NWO) under an NWO-MaG Pionier grant.
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Gaunersdorfer, A., Hommes, C. (2007). A Nonlinear Structural Model for Volatility Clustering. In: Teyssière, G., Kirman, A.P. (eds) Long Memory in Economics. Springer, Berlin, Heidelberg . https://doi.org/10.1007/978-3-540-34625-8_9
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