Digital exchanges, which convert funds between national currencies and cryptocurrencies, are often the victims of cybersecurity attacks. We investigate the impact of such cybersecurity breaches on bitcoin returns. Using several alternative specifications we test the hypothesis that bitcoin...

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)...

We give a set of identifying conditions for simultaneous equation systems (SES) with heteroskedasticity in the framework of the Gaussian quasi maximum likelihood (QML) approach. Our conditions rely on the presence of heteroskedasticity rather than exclusion restrictions. The QML estimators are...

We give a set of identifying conditions for simultaneous equation systems (SES) with heteroskedasticity in the framework of the Gaussian quasi maximum likelihood (QML) approach. Our conditions rely on the presence of heteroskedasticity rather than exclusion restrictions. The QML estimators are...

I investigate the impact of the Global Financial Crisis (GFC) on the returns and volatilities of eleven major European share markets, and test the proposition that the GFC developed over two stages: a subprime mortgage crisis (pre-Lehman), and a more severe global liquidity shortage phase...