Herd behavior and aggregate fluctuations in financial markets

Details Herd behavior and aggregate fluctuations in financial markets Herd behavior and aggregate fluctuations in financial markets

1997-12-30

arxiv.org/abs/cond-mat/9712318v2

Physics

Condensed Matter

Statistical Mechanics

Minor modifications in text, references added. 29 pages, typesetted using LATEX

Scientific paper

We present a simple model of a stock market where a random communication structure between agents gives rise to a heavy tails in the distribution of stock price variations in the form of an exponentially truncated power-law, similar to distributions observed in recent empirical studies of high frequency market data. Our model provides a link between two well-known market phenomena: the heavy tails observed in the distribution of stock market returns on one hand and 'herding' behavior in financial markets on the other hand. In particular, our study suggests a relation between the excess kurtosis observed in asset returns, the market order flow and the tendency of market participants to imitate each other.

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