Physics – Condensed Matter – Statistical Mechanics
Scientific paper
2003-12-18
European Physical Journal B 38 (2004) 671-677
Physics
Condensed Matter
Statistical Mechanics
15 pages, 4 figures
Scientific paper
10.1140/epjb/e2004-00161-6
We study the activity, i.e., the number of transactions per unit time, of financial markets. Using the diffusion entropy technique we show that the autocorrelation of the activity is caused by the presence of peaks whose time distances are distributed following an asymptotic power law which ultimately recovers the Poissonian behavior. We discuss these results in comparison with ARCH models, stochastic volatility models and multi-agent models showing that ARCH and stochastic volatility models better describe the observed experimental evidences.
Masoliver Jaume
Montero Miquel
Palatella Luigi
Perelló Josep
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