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Which are the SIFIs? A Component Expected Shortfall (CES) Approach to Systemic Risk

27 Pages Posted: 22 Oct 2012  

Elena Dumitrescu

European University Institute; University of Orleans - Laboratoire d'économie d'Orléans

Denisa Georgiana Banulescu

University of Orleans; Maastricht School of Business and Economics

Date Written: October 2012

Abstract

In this paper we propose a component approach to systemic risk which makes it possible to decompose the risk of the aggregate financial system (measured by Expected Shortfall, ES) while accounting for the level of firm's characteristics. Developed by analogy with the Component Value-at-Risk concept (Jorion, 2007), our new, simple and parsimonious method to identify systemically important institutions, labeled Component ES (CES), presents several advantages. First, it relies on higher frequency (daily) publicly available data, which incorporates useful information for forecasting systemic risks, and it encompasses the popular Marginal ES measure. It hence does not consider the liabilities (not available in daily) to assess the systemically riskiness of a firm as the SRISK (Engle and Brownlees, 2011) does. Second, it allows us to select the riskiest financial firms on the market by directly ranking them according to their riskiness. The larger the contribution, the more systemically important the institution. Most importantly, our measure can be used not only to assess the contribution of a rm to systemic risk at a precise date (in-sample), but also to forecast its contribution in a certain period (out-of-sample). An empirical application on a set of financial institutions similar to that employed by Brownlees and Engle (2011) ascertains the ability of CES to identify the most systemically risky firms during the 2007-2009 financial crisis.

Keywords: Systemic Risk, Component Expected Shortfall, Marginal Expected Shortfall, Forecasting

JEL Classification: C22, C53, G01, G32

Suggested Citation

Dumitrescu, Elena and Banulescu, Denisa Georgiana, Which are the SIFIs? A Component Expected Shortfall (CES) Approach to Systemic Risk (October 2012). Available at SSRN: https://ssrn.com/abstract=2165004 or http://dx.doi.org/10.2139/ssrn.2165004

Elena Dumitrescu

European University Institute ( email )

Villa La Fonte
10 Via delle Fontanelle
Firenze (Florence), 50014
Italy

University of Orleans - Laboratoire d'économie d'Orléans ( email )

Rue de Blois BP6739
Rue de Blois
Orléans cedex 2, Centre 45067
France

Denisa Banulescu (Contact Author)

University of Orleans ( email )

Rue de Blois
B.P. 6739
45067 Orleans Cedex 2, Orleans cedex 2 45067
France

Maastricht School of Business and Economics ( email )

P.O. Box 616
Maastricht, 6200 MD
Netherlands

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