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Ultrafast Extreme Events: Empirical Analysis of Mechanisms and Recovery in a Historical Perspective

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  • Luca Henrichs
  • Anton J. Heckens
  • Thomas Guhr

Abstract

To understand the emergence of Ultrafast Extreme Events (UEEs), the influence of algorithmic trading or high-frequency traders is of major interest as they make it extremely difficult to intervene and to stabilize financial markets. In an empirical analysis, we compare various characteristics of UEEs over different years for the US stock market to assess the possible non-stationarity of the effects. We show that liquidity plays a dominant role in the emergence of UEEs and find a general pattern in their dynamics. We also empirically investigate the after-effects in view of the recovery rate. We find common patterns for different years. We explain changes in the recovery rate by varying market sentiments for the different years.

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  • Luca Henrichs & Anton J. Heckens & Thomas Guhr, 2025. "Ultrafast Extreme Events: Empirical Analysis of Mechanisms and Recovery in a Historical Perspective," Papers 2509.10376, arXiv.org.
    • Handle: RePEc:arx:papers:2509.10376
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