Built-In Challenges Within the New Supervisory Architecture of the Eurozone

We analyse a sample of systemically important European financial intermediaries that fall under the Single Supervisory Mechanism, which is part of the new institutional supervisory architecture of the Eurozone. Theory suggests that herding among financial intermediaries raises cross-sectional correlations and has negative implications for systemic risk. Empirically, herding behaviors are associated with clusters identifying commonalities in asset allocations and risk strategies. By adopting a novel clustering approach, we analyse whether some pre-determined classifications and criteria associated with this new supervisory framework can adequately capture financial intermediaries' herding behavior. We find that simple classifications and criteria, which are less likely to be policy-biased, are more efficient than complex ones when it comes to identifying commonalities posing the highest threats to systemic risk. The findings also confirm the need for a macro- rather than micro- prudential approach to financial supervision by highlighting the importance of using a supervisory toolkit that includes indicators with a stronger cross-sectional and network dimension. Our methodology can serve as a final consistency check for quantitative-based classifications and criteria employed by supervisory authorities