Why do Hurst exponents of traded value increase as the logarithm of company size?

Details Why do Hurst exponents of traded value increase as the logarithm of company size? Why do Hurst exponents of traded value increase as the logarithm of company size?

2006-03-13

arxiv.org/abs/physics/0603098v1

Physics

Physics and Society

10 pages, 4 figures, to appear in the Proceedings of the International Workshop on Econophysics of Stock Markets and Minority

Scientific paper

The common assumption of universal behavior in stock market data can sometimes lead to false conclusions. In statistical physics, the Hurst exponents characterizing long-range correlations are often closely related to universal exponents. We show, that in the case of time series of the traded value, these Hurst exponents increase logarithmically with company size, and thus are non-universal. Moreover, the average transaction size shows scaling with the mean transaction frequency for large enough companies. We present a phenomenological scaling framework that properly accounts for such dependencies.

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