Herd Behaviors in Financial Markets

Details Herd Behaviors in Financial Markets Herd Behaviors in Financial Markets

2004-05-09

arxiv.org/abs/cond-mat/0405172v1

J. Korean Phys. Soc. 44, 647 (2004)

Physics

Condensed Matter

Statistical Mechanics

15 pages, 6 figures

Scientific paper

We investigate the herd behavior of returns for the yen-dollar exchange rate in the Japanese financial market. It is obtained that the probability distribution $P(R)$ of returns $R$ satisfies the power-law behavior $P(R) \simeq R^{-\beta}$ with the exponents $ \beta=3.11$(the time interval $\tau=$ one minute) and 3.36($\tau=$ one day). The informational cascade regime appears in the herding parameter $H\ge 2.33$ at $\tau=$ one minute, while it occurs no herding at $\tau=$ one day. Especially, we find that the distribution of normalized returns shows a crossover to a Gaussian distribution at one time step $\Delta t=1$ day.

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