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Cross-correlation asymmetries and causal relationships between stock and market risk

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  • Stanislav S. Borysov
  • Alexander V. Balatsky
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    Abstract

    We study historical correlations and lead-lag relationships between individual stock risk (volatility of daily stock returns) and market risk (volatility of daily returns of a market-representative portfolio) in the US stock market. We consider the cross-correlation functions averaged over all stocks, using 71 stock prices from the Standard \& Poor's 500 index for 1994--2013. We focus on the behavior of the cross-correlations at the times of financial crises with significant jumps of market volatility. The observed historical dynamics showed that the dependence between the risks was almost linear during the US stock market downturn of 2002 and after the US housing bubble in 2007, remaining on that level until 2013. Moreover, the averaged cross-correlation function often had an asymmetric shape with respect to zero lag in the periods of high correlation. We develop the analysis by the application of the linear response formalism to study underlying causal relations. The calculated response functions suggest the presence of characteristic regimes near financial crashes, when the volatility of an individual stock follows the market volatility and vice versa.

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    File URL: http://arxiv.org/pdf/1401.8106
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    Bibliographic Info

    Paper provided by arXiv.org in its series Papers with number 1401.8106.

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    Date of creation: Jan 2014
    Date of revision: Jul 2014
    Publication status: Published in PLoS ONE 9(8): e105874 (2014)
    Handle: RePEc:arx:papers:1401.8106

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    Web page: http://arxiv.org/

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