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Heterogeneity and feedback in an agent-based market model

François Ghoulmie1, Rama Cont2 and Jean-Pierre Nadal1

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We propose an agent-based model of a single-asset financial market, described in terms of a small number of parameters, which generates price returns with statistical properties similar to the stylized facts observed in financial time series. Our agent-based model generically leads to the absence of autocorrelation in returns, self-sustaining excess volatility, mean-reverting volatility, volatility clustering and endogenous bursts of market activity non-attributable to external noise. The parsimonious structure of the model allows the identification of feedback and heterogeneity as the key mechanisms leading to these effects.


PACS

02.50.-r Probability theory, stochastic processes, and statistics

Subjects

Computational physics

Dates

Issue 14 (13 April 2005)

Received 3 September 2004, in final form 17 November 2004

Published 24 March 2005



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