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Exogenous and Endogenous Price Jumps Belong to Different Dynamical Classes

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  • Riccardo Marcaccioli
  • Jean-Philippe Bouchaud
  • Michael Benzaquen

Abstract

Synchronising a database of stock specific news with 5 years worth of order book data on 300 stocks, we show that abnormal price movements following news releases (exogenous) exhibit markedly different dynamical features from those arising spontaneously (endogenous). On average, large volatility fluctuations induced by exogenous events occur abruptly and are followed by a decaying power-law relaxation, while endogenous price jumps are characterized by progressively accelerating growth of volatility, also followed by a power-law relaxation, but slower than for exogenous jumps. Remarkably, our results are reminiscent of what is observed in different contexts, namely Amazon book sales and YouTube views. Finally, we show that fitting power-laws to {\it individual} volatility profiles allows one to classify large events into endogenous and exogenous dynamical classes, without relying on the news feed.

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  • Riccardo Marcaccioli & Jean-Philippe Bouchaud & Michael Benzaquen, 2021. "Exogenous and Endogenous Price Jumps Belong to Different Dynamical Classes," Papers 2106.07040, arXiv.org.
    • Handle: RePEc:arx:papers:2106.07040
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    File URL: http://arxiv.org/pdf/2106.07040
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    Cited by:

    1. Jean-Philippe Bouchaud, 2021. "The Inelastic Market Hypothesis: A Microstructural Interpretation," Papers 2108.00242, arXiv.org, revised Jan 2022.

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