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ON BOUNCING GEOMETRIC BROWNIAN MOTIONS

Published online by Cambridge University Press:  27 December 2018

Xin Liu
Affiliation:
School of Mathematical and Statistical Sciences, Clemson University, Clemson, SC 29634, USA E-mail: xliu9@clemson.edu
Vidyadhar G. Kulkarni
Affiliation:
Department of Statistics and Operations Research, University of North Carolina, Chapel Hill, NC 27599, USA E-mail: vkulkarn@email.unc.edu; qgong@email.unc.edu
Qi Gong
Affiliation:
Department of Statistics and Operations Research, University of North Carolina, Chapel Hill, NC 27599, USA E-mail: vkulkarn@email.unc.edu; qgong@email.unc.edu
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Abstract

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A pair of bouncing geometric Brownian motions (GBMs) is studied. The bouncing GBMs behave like GBMs except that, when they meet, they bounce off away from each other. The object of interest is the position process, which is defined as the position of the latest meeting point at each time. We study the distributions of the time and position of their meeting points, and show that the suitably scaled logarithmic position process converges weakly to a standard Brownian motion as the bounce size δ→0. We also establish the convergence of the bouncing GBMs to mutually reflected GBMs as δ→0. Finally, applying our model to limit order books, we derive a simple and effective prediction formula for trading prices.

Information

Type
Research Article
Copyright
Copyright © Cambridge University Press 2018