Central Bank Ireland, Research Technical Paper 08/RT/17.
Since the 2008 global financial crisis (GFC) several systemic risk measures (SRMs) have gained traction in the literature. This paper examines whether Delta-CoVaR (CoVaR) is relevant in the context of European banks and compares risk rankings against those found using marginal expected shortfall (MES). The analysis reveals that a cluster of large banks, operating in one particular country, is the principal contributor to financial system risk, if measured by CoVaR. When the direction of risk flow is reversed, i.e. from the system to the institution (via MES), a second cluster of banks, headquartered in a different jurisdiction, would be most affected by a large and systemic financial shock. The analysis reveals that future realisations of systemic risk is strongly associated with institution size, maturity mismatch, non-performing loans and non-interest-to-interest-income ratios. However, in certain cases, the relationship depends upon the systemic risk measure used. For example, forward bank leverage appears correlated with MES but not with CoVaR.