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Measuring Persistence in Volatility Spillovers

Conrad, Christian ; Weber, Enzo

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This paper analyzes volatility spillovers in multivariate GARCH-type models. We show that the cross-effects between the conditional variances determine the persistence of the transmitted volatility innovations. In particular, the effect of a foreign volatility innovation on a conditional variance is even more persistent than the effect of an own innovation unless it is offset by an accompanying negative variance spillover of sufficient size. Moreover, ignoring a negative variance spillover causes a downward bias in the estimate of the initial impact of the foreign volatility innovation. Applying the concept to portfolios of small and large firms, we find that shocks to small firm returns affect the large firm conditional variance once we allow for (negative) spillovers between the conditional variances themselves.

Item Type: Working paper
Series Name: Discussion Paper Series / University of Heidelberg, Department of Economics
Volume: 0543
Date Deposited: 12 Apr 2013 11:46
Date: April 2013
Number of Pages: 27
Faculties / Institutes: The Faculty of Economics and Social Studies > Alfred-Weber-Institut for Economics
Subjects: 330 Economics
Uncontrolled Keywords: Multivariate GARCH, spillover, persistence, small and large firms.
Schriftenreihe ID: Discussion Paper Series / University of Heidelberg, Department of Economics
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