Volatility fingerprints of large shocks: Endogeneous versus exogeneous

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dc.creatorSornette, D.
dc.creatorMalevergne, Y.
dc.creatorMuzy, J. F.
dc.date2002-04-30
dc.date.accessioned2026-07-07T12:06:40Z
dc.date.available2026-07-07T12:06:40Z
dc.descriptionFinance is about how the continuous stream of news gets incorporated into prices. But not all news have the same impact. Can one distinguish the effects of the Sept. 11, 2001 attack or of the coup against Gorbachev on Aug., 19, 1991 from financial crashes such as Oct. 1987 as well as smaller volatility bursts? Using a parsimonious autoregressive process with long-range memory defined on the logarithm of the volatility, we predict strikingly different response functions of the price volatility to great external shocks compared to what we term endogeneous shocks, i.e., which result from the cooperative accumulation of many small shocks. These predictions are remarkably well-confirmed empirically on a hierarchy of volatility shocks. Our theory allows us to classify two classes of events (endogeneous and exogeneous) with specific signatures and characteristic precursors for the endogeneous class. It also explains the origin of endogeneous shocks as the coherent accumulations of tiny bad news, and thus unify all previous explanations of large crashes including Oct. 1987.
dc.descriptionLatex document, 12 pages, 2 figures
dc.identifierhttps://arxiv.org/abs/cond-mat/0204626
dc.identifierhttp://arxiv.org/abs/cond-mat/0204626
dc.identifierWhat causes crashes? Risk Volume 16 (2), 67-71 (February 2003)
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/208723
dc.subjectStatistical Mechanics
dc.subjectStatistical Finance
dc.titleVolatility fingerprints of large shocks: Endogeneous versus exogeneous
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