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La medición del riesgo en eventos extremos. Una revisión metodológica en contexto

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  • Uribe Gil, Jorge Mario
  • Ulloa Villegas, Inés Maria

Abstract

Resumen: En este documento se exploran varias metodologías para el cálculo del Valor en Riesgo (VeR)utilizadas actualmente en la regulación internacional y la administración de portafolios. Se exponen laslimitantes de las mismas y las posibles consecuencias de ignorarlas, ilustradas por la pasada crisis financiera global (2007-2009). Se estiman también medidas de pérdida esperada en las colas, basadas en la Teoría del Valor Extremo y se contrastan con las estimaciones del VeR con el fin de generar un ranking de riesgo entre varios mercados accionarios del mundo. El estudio se realiza para varios países en Latinoamérica y algunos países desarrollados. Se corrobora la lección ampliamente senalada por la literatura académica de que el VeR no es adecuado para la medición del riesgo en momentos en los cuales el mercado se enfrenta a choques extremos. De esa forma se resalta la necesidad de utilizar medidas más robustas enfocadas en las colas de la distribución para la medición del riesgo.Abstract: This paper reviews the basic methodologies for the estimation of Value at Risk (VaR) that are currently in use in international stock and financial market regulation and portfolio management. The main shortcomings of these methodologies are exposed and the direct consequences of ignoring these limitations are analyzed, the latter highlighted by the recent global financial crisis of 2007-2009. In addition, methodologies for the estimation of expected tail losses, based on the Extreme Value Theory, are examined. Both kinds of measures are contrasted with the aim to create a `risk ranking´ of different stock markets around the world. The study explores the major Latin American markets and some in developed countries. The lessons widely highlighted in the academic literature related to the shortcomings of VaR when markets face extreme events are corroborated. The paper concludes by stressing the need for more robust measures focused on the tails of the distribution in the measurement of risk.

Suggested Citation

  • Uribe Gil, Jorge Mario & Ulloa Villegas, Inés Maria, 2012. "La medición del riesgo en eventos extremos. Una revisión metodológica en contexto," Revista Lecturas de Economía, Universidad de Antioquia, CIE, June.
    • Handle: RePEc:col:000174:010149
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    More about this item

    Keywords

    Valor en riesgo; pérdida esperada en la colas; teoría del valor extremo; mercados latinoamericanos; riesgos extremos;
    All these keywords.

    JEL classification:

    • G01 - Financial Economics - - General - - - Financial Crises
    • G15 - Financial Economics - - General Financial Markets - - - International Financial Markets
    • G18 - Financial Economics - - General Financial Markets - - - Government Policy and Regulation
    • C58 - Mathematical and Quantitative Methods - - Econometric Modeling - - - Financial Econometrics

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