Existing literature suggests that conditional correlations between equity markets vary over time, and increase over periods of financial crises. I test this hypothesis on a set of eight national equity indices from the Asia-Pacific region on one hand, and the US market on the other. Tse (2000)...

Changes in residual volatility in vector autoregressive (VAR) models can be used for identifying structural shocks in a structural VAR analysis. Testable conditions are given for full identification for the case where the volatility changes can be modelled by a multivariate GARCH process. Formal...

In the framework of structural VAR models with ARCH effect, we show that a sufficient condition for the local identification of a structural model is that at most one structural shock is homoskedastic. Our approach is based on a result of Rothenberg (1971)