Basel II and Operational Risk: Implications for Risk Measurement and Management in the Financial Sector

National Bank of Belgium Working Paper No. 51

58 Pages Posted: 14 Oct 2010

See all articles by Ariane Chapelle

Ariane Chapelle

University College London - Department of Computer Science

Yves Crama

University of Liège - HEC Management School

Georges Hübner

HEC Liège

Jean-Philippe Peters

Deloitte Luxembourg; University of Liège - Economics, Business Administration and Social Sciences

Date Written: May 18, 2004

Abstract

This paper proposes a methodology to analyze the implications of the Advanced Measurement Approach (AMA) for the assessment of operational risk put forward by the Basel II Accord. The methodology relies on an integrated procedure for the construction of the distribution of aggregate losses, using internal and external loss data. It is illustrated on a 2x2 matrix of two selected business lines and two event types, drawn from a database of 3000 losses obtained from a large European banking institution. For each cell, the method calibrates three truncated distributions functions for the body of internal data, the tail of internal data, and external data. When the dependence structure between aggregate losses and the non-linear adjustment of external data are explicitly taken into account, the regulatory capital computed with the AMA method proves to be substantially lower than with less sophisticated approaches allowed by the Basel II Accord, although the effect is not uniform for all business lines and event types. In a second phase, our models are used to estimate the effects of operational risk management actions on bank profitability, through a measure of RAROC adapted to operational risk. The results suggest that substantial savings can be achieved through active management techniques, although the estimated effect of a reduction of the number, frequency or severity of operational losses crucially depends on the calibration of the aggregate loss distributions.

Keywords: operational risk management, basel II, advanced measurement approach, copulae, external data, EVT, RAROC, cost-benefit analysis

JEL Classification: C24, G18, G21

Suggested Citation

Chapelle, Ariane and Crama, Yves and Hübner, Georges and Peters, Jean-Philippe, Basel II and Operational Risk: Implications for Risk Measurement and Management in the Financial Sector (May 18, 2004). National Bank of Belgium Working Paper No. 51, Available at SSRN: https://ssrn.com/abstract=1691592 or http://dx.doi.org/10.2139/ssrn.1691592

Ariane Chapelle (Contact Author)

University College London - Department of Computer Science ( email )

Gower Street
London, WC1E 6BT
United Kingdom
+44(0)7833453854 (Phone)

Yves Crama

University of Liège - HEC Management School ( email )

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LIEGE, Liege 4000
Belgium

Georges Hübner

HEC Liège ( email )

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Belgium
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Jean-Philippe Peters

Deloitte Luxembourg ( email )

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Luxembourg
+352 451 452 276 (Phone)
+352 451 452 746 (Fax)

HOME PAGE: http://www.deloitte.lu

University of Liège - Economics, Business Administration and Social Sciences

Bld du Rectorat 7 Bat. B31
Liege B-4000
Belgium

HOME PAGE: http://www.egss.ulg.ac.be

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