Herd behavior and aggregate fluctuations in financial markets
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.
|Date of creation:||Dec 1997|
|Date of revision:||Jan 1998|
|Publication status:||Published in Macroeconomic Dynamics, 2000, Volume 4, No 2, 170-196|
|Contact details of provider:|| Web page: http://arxiv.org/|
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