# Herd Behaviors in Financial Markets

## Author Info

• Kyungsik Kim
• Seong-Min Yoon
• J. S. Choi
• Hideki Takayasu

## Abstract

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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File URL: http://arxiv.org/pdf/cond-mat/0405172

## Bibliographic Info

Paper provided by arXiv.org in its series Papers with number cond-mat/0405172.

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 Length: Date of creation: May 2004 Date of revision: Publication status: Published in J. Korean Phys. Soc. 44, 647 (2004) Handle: RePEc:arx:papers:cond-mat/0405172 Contact details of provider: Web page: http://arxiv.org/

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