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Issue Q2 2014  
Where is the system?  
Sylvain Benoit
The aim of this paper is to determine the optimal size of the system (global, supranational or national) when measuring the systemic importance of a bank. Since 2011, the Basel Committee on Banking Supervision (BCBS) has tagged global systemically important banks (G-SIBs) and has imposed a higher regulatory capital of loss absorbency (HLA) requirement. However, the identification of G-SIBs may overlook banks with major domestic systemic importance, i.e. the domestic systemically important banks (D-SIBs). This paper describes how to adjust market-based systemic risk measures to identify D-SIBs. In an empirical analysis within the eurozone, I show that (i) the SRISK methodology produces similar rankings whatever the system used. However, (ii) the SRISK values greatly vary across systems, which calls for imposing the higher of either D-SIB or G-SIB HLA requirements. Finally, (iii) the ΔCoVaR methodology is extremely sensitive to the choice of the system. Abstract

Systemic risk ; Financial regulation ; SRISK ; G-SIBs ; D-SIBs ; Keywords
G01 ; G28 ; G32 ; JEL classification
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