Abstract
In a simple model of financial market dynamics, we allow the price of a risky security to be set by a market maker depending on the excess demand of heterogeneous interacting traders, fundamentalists and chartists, who place their orders based upon different expectations schemes about future prices: while chartists rely on standard trend-based rules, fundamentalists are assumed to know the economic environment and to form their beliefs accordingly. As price moves away from the long-run fundamental, fundamentalists become less confident in their forecasts, and put increasing weight on a reversion towards the fundamental price. The resulting two-dimensional discrete time dynamical system can exhibit a rich range of dynamic scenarios, often characterized by coexistence of attractors. A simple noisy version of the model reveals a variety of possible patterns for return time series.
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Chiarella, C., Dieci, R., Gardini, L. et al. A Model of Financial Market Dynamics with Heterogeneous Beliefs and State-Dependent Confidence. Comput Econ 32, 55–72 (2008). https://doi.org/10.1007/s10614-008-9131-9
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DOI: https://doi.org/10.1007/s10614-008-9131-9