Evolutionary and Institutional Economics Review

, Volume 13, Issue 2, pp 469–480 | Cite as

A model of transaction signs with order splitting and public information

  • Joshin MuraiEmail author


Applying a method of the cluster expansion developed in a study of statistical mechanics, a new mathematical model has been structured to account for the reason that a time series of transaction signs in financial markets has a long memory property. A basic assumption for the model was that investors split their hidden orders into small pieces before execution. The effect of public information also was taken into consideration. A mathematical expression of investors’ investment behavior generates a discrete time stochastic process of cumulative transaction signs. The strong law of large numbers holds for the process: it converges to a trend term almost surely. The distribution of the fluctuation around the trend term weakly converges to the distribution of a superposition of a stochastic integral with respect to a Brownian motion and stochastic integrals with respect to a fractional Brownian motions with Hurst exponents greater than one-half. Namely, increments of the derived process have a long memory property.


Order sign Long memory Fractional Brownian motion 

JEL Classification

C02 C22 G10 



The authors thank the Yukawa Institute for Theoretical Physics at Kyoto University. Discussions during the YITP workshop YITP-W-15-15 on ``Econophysics 2015'' were useful to complete this work.


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Copyright information

© Japan Association for Evolutionary Economics 2016

Authors and Affiliations

  1. 1.Graduate School of Humanities and Social SciencesOkayama UniversityOkayamaJapan

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