The European Physical Journal B

, Volume 73, Issue 1, pp 41–49 | Cite as

Liquidity crisis, granularity of the order book and price fluctuations

Topical Issue on Interdisciplinary Applications of Physics in Economics and Finance

Abstract

We introduce a microscopic model for the dynamics of the order book to study how the lack of liquidity influences price fluctuations. We use the average density of the stored orders (granularity g) as a proxy for liquidity. This leads to a Price Impact Surface which depends on both volume ω and g. The dependence on the volume (averaged over the granularity) of the Price Impact Surface is found to be a concave power law function 〈φ(ω,g)〉g∼ωδ with δ≈0.59. Instead the dependence on the granularity is φ(ω,g|ω)∼gα with α≈-1, showing a divergence of price fluctuations in the limit g→0. Moreover, even in intermediate situations of finite liquidity, this effect can be very large and it is a natural candidate for understanding the origin of large price fluctuations.

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Copyright information

© EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg 2009

Authors and Affiliations

  • M. Cristelli
    • 1
  • V. Alfi
    • 1
    • 2
  • L. Pietronero
    • 1
    • 3
  • A. Zaccaria
    • 1
  1. 1.Dip. di Fisica, Università “La Sapienza”RomaItaly
  2. 2.Centro “E. Fermi”, Compendio ViminaleRomaItaly
  3. 3.ISC-CNR, V. dei Taurini 19RomaItaly

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