title: Backward jump continuous-time random walk: an application to market trading.
abstract: The backward jump modification of the continuous-time random walk model or the version of the model driven by the negative feedback was herein derived for spatiotemporal continuum in the context of a share price evolution on a stock exchange. In the frame of the model, we described stochastic evolution of a typical share price on a stock exchange with a moderate liquidity within a high-frequency time scale. The model was validated by satisfactory agreement of the theoretical velocity autocorrelation function with its empirical counterpart obtained for the continuous quotation. This agreement is mainly a result of a sharp backward correlation found and considered in this article. This correlation is a reminiscence of such a bid-ask bounce phenomenon where backward price jump has the same or almost the same length as preceding jump. We suggested that this correlation dominated the dynamics of the stock market with moderate liquidity. Although assumptions of the model were inspired by the market high-frequency empirical data, its potential applications extend beyond the financial market, for instance, to the field covered by the Le Chatelier-Braun principle of contrariness.
authors.affiliation: Division of Physics Education, Institute of Experimental Physics, Faculty of Physics, University of Warsaw, Smyczkowa Str 5/7, PL-02678 Warsaw, Poland. tomasz.gubiec@fuw.edu.pl
authors.forename: Tomasz
authors.initials: T
authors.lastname: Gubiec
authors.forename: Ryszard
authors.initials: R
authors.lastname: Kutner