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Are all highly liquid securities within the same class?

Are all highly liquid securities within the same class?
In this manuscript we analyse the leading statistical properties of fluctuations of (log) 3-month US Treasury bill quotation in the secondary market, namely: probability density function, autocorrelation, absolute values autocorrelation, and absolute values persistency. We verify that this financial instrument, in spite of its high liquidity, shows very peculiar properties. Particularly, we verify that log-fluctuations belong to the Levy class of stochastic variables.
To be published in EPJB
Physics - Physics and Society, Statistical Finance (q-fin.ST), Quantitative Finance - Statistical Finance, FOS: Physical sciences, Physics and Society (physics.soc-ph), FOS: Economics and business, Physics - Data Analysis, Statistics and Probability, 05.90.+m Other topics in statistical physics, thermodynamics, and nonlinear dynamical systems, 05.45.Tp Time series analysis, 89.65.Gh Economics; econophysics, financial markets, business and management,, Data Analysis, Statistics and Probability (physics.data-an)
Physics - Physics and Society, Statistical Finance (q-fin.ST), Quantitative Finance - Statistical Finance, FOS: Physical sciences, Physics and Society (physics.soc-ph), FOS: Economics and business, Physics - Data Analysis, Statistics and Probability, 05.90.+m Other topics in statistical physics, thermodynamics, and nonlinear dynamical systems, 05.45.Tp Time series analysis, 89.65.Gh Economics; econophysics, financial markets, business and management,, Data Analysis, Statistics and Probability (physics.data-an)
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