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Discrete Dynamics in Nature and Society
Volume 2010, Article ID 676317, 27 pages
Research Article

Updating Wealth in an Asset Pricing Model with Heterogeneous Agents

Department of Economic and Financial Institutions, University of Macerata, 62100 Macerata, Italy

Received 21 January 2010; Revised 18 June 2010; Accepted 20 September 2010

Academic Editor: Xue He

Copyright © 2010 Serena Brianzoni et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


We consider an asset-pricing model with wealth dynamics in a market populated by heterogeneous agents. By assuming that all agents belonging to the same group agree to share their wealth whenever an agent joins the group (or leaves it), we develop an adaptive model which characterizes the evolution of wealth distribution when agents switch between different trading strategies. Two groups with heterogeneous beliefs are considered: fundamentalists and chartists. The model results in a nonlinear three-dimensional dynamical system, which we have studied in order to investigate complicated dynamics and to explain wealth distribution among agents in the long run.