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Derivation of the Boltzmann Equation for Financial Brownian Motion: Direct Observation of the Collective Motion of High-Frequency Traders
Phys. Rev. Lett. 120, 138301 – Published 27 March, 2018
DOI: https://doi.org/10.1103/PhysRevLett.120.138301
Abstract
A microscopic model is established for financial Brownian motion from the direct observation of the dynamics of high-frequency traders (HFTs) in a foreign exchange market. Furthermore, a theoretical framework parallel to molecular kinetic theory is developed for the systematic description of the financial market from microscopic dynamics of HFTs. We report first on a microscopic empirical law of traders’ trend-following behavior by tracking the trajectories of all individuals, which quantifies the collective motion of HFTs but has not been captured in conventional order-book models. We next introduce the corresponding microscopic model of HFTs and present its theoretical solution paralleling molecular kinetic theory: Boltzmann-like and Langevin-like equations are derived from the microscopic dynamics via the Bogoliubov-Born-Green-Kirkwood-Yvon hierarchy. Our model is the first microscopic model that has been directly validated through data analysis of the microscopic dynamics, exhibiting quantitative agreements with mesoscopic and macroscopic empirical results.
Physics Subject Headings (PhySH)
- Brownian motion
- Econophysics
- Kinetic theory
- Nonequilibrium statistical mechanics
- Scaling laws of complex systems
- Social systems
- Stochastic processes
- Social dynamics
- Approximation methods for many-body systems
- Brownian dynamics
- Data analysis
- Langevin equation
- Mean field theory
- Monte Carlo methods
- Stochastic analysis
- Time series analysis
Synopsis
Financial Brownian Motion
Using data on the activity of individual financial traders, researchers have devised a microscopic financial model that can explain macroscopic market trends.
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