Systemic bank risk in Brazil: an assessment of correlated market, credit, sovereign and inter-bank risk in an environment with stochastic volatilities and correlations
In this study we develop and demonstrate a powerful and flexible forward-looking portfolio simulation methodology for assessing the correlated impacts of market risk, and private sector, sovereign and inter-bank default risk on both individual banks (i.e. 28 of the largest Brazilian banks) and groups of banks (i.e. the Brazilian banking system). The methodology importantly accounts for bank asset and liability maturity and currency mismatches and loan portfolio credit quality and sector and region concentrations. In a significant innovation, financial and economic environment variables are modeled with stochastic volatilities and correlations. We demonstrate the reliability of the models by comparing simulated and historical credit transition probabilities, simulated and historical bank rates of return, and simulated versus actual bank credit ratings. When omitting sovereign risk our analysis indicates that none of the banks face significant default risk over a 1-year horizon. This low default risk stems primarily from the large amount of government securities held by Brazilian banks, but also reflects the banks' adequate capitalizations and extraordinarily high interest rate spreads. Once sovereign risk is considered and losses in the market value of government securities reaches 10 percent (or higher), several banks face potential solvency problems. These results demonstrate the well known risk of concentrated lending to a borrower which has a non-zero probability of default (e.g. Government of Brazil). We also demonstrate the potential systemic risk impact of variation in average recovery rates on defaulted private sector loans which reflect, among other factors, bank lending policies, the efficiency of the legal system in resolving defaults, and aggregate levels of defaults. Our analysis also highlights the importance of accounting for the differential risk characteristics of various banks and for the inter-bank risk channel, through which a systemic crisis may propagate. It further indicates that, in the event of a sovereign default, the Government of Brazil would face constrained debt management alternatives. To the best of our knowledge no one else has put forward a systematic methodology for assessing correlated market and credit (sovereign, corporate and inter-bank) default risk for a financial system.
|Date of creation:||2008|
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- Lehar, Alfred, 2005. "Measuring systemic risk: A risk management approach," Journal of Banking & Finance, Elsevier, vol. 29(10), pages 2577-2603, October.
- Merton, Robert C, 1974.
"On the Pricing of Corporate Debt: The Risk Structure of Interest Rates,"
Journal of Finance,
American Finance Association, vol. 29(2), pages 449-70, May.
- Merton, Robert C., 1973. "On the pricing of corporate debt: the risk structure of interest rates," Working papers 684-73., Massachusetts Institute of Technology (MIT), Sloan School of Management.
- Hull, John & White, Alan, 1990. "Pricing Interest-Rate-Derivative Securities," Review of Financial Studies, Society for Financial Studies, vol. 3(4), pages 573-92.
- Jarrow, Robert A. & Turnbull, Stuart M., 2000. "The intersection of market and credit risk," Journal of Banking & Finance, Elsevier, vol. 24(1-2), pages 271-299, January.
- Gorton, Gary, 1985. "Bank suspension of convertibility," Journal of Monetary Economics, Elsevier, vol. 15(2), pages 177-193, March.
- Black, Fischer & Scholes, Myron S, 1973. "The Pricing of Options and Corporate Liabilities," Journal of Political Economy, University of Chicago Press, vol. 81(3), pages 637-54, May-June.
- Douglas W. Diamond & Philip H. Dybvig, 2000.
"Bank runs, deposit insurance, and liquidity,"
Federal Reserve Bank of Minneapolis, issue Win, pages 14-23.
- Marshall E. Blume & Felix Lim & A. Craig Mackinlay, 1998. "The Declining Credit Quality of U.S. Corporate Debt: Myth or Reality?," Journal of Finance, American Finance Association, vol. 53(4), pages 1389-1413, 08.
- Longstaff, Francis A & Schwartz, Eduardo S, 1995. " A Simple Approach to Valuing Risky Fixed and Floating Rate Debt," Journal of Finance, American Finance Association, vol. 50(3), pages 789-819, July.
- Hull, John & White, Alan, 1993. "One-Factor Interest-Rate Models and the Valuation of Interest-Rate Derivative Securities," Journal of Financial and Quantitative Analysis, Cambridge University Press, vol. 28(02), pages 235-254, June.
- Jafry, Yusuf & Schuermann, Til, 2004. "Measurement, estimation and comparison of credit migration matrices," Journal of Banking & Finance, Elsevier, vol. 28(11), pages 2603-2639, November.
- De Bandt, Olivier & Hartmann, Philipp, 2000.
"Systemic risk: A survey,"
Working Paper Series
0035, European Central Bank.
- Acharya, Viral V., 2009.
"A theory of systemic risk and design of prudential bank regulation,"
Journal of Financial Stability,
Elsevier, vol. 5(3), pages 224-255, September.
- Acharya, Viral V, 2009. "A Theory of Systemic Risk and Design of Prudential Bank Regulation," CEPR Discussion Papers 7164, C.E.P.R. Discussion Papers.
- Marshall E. Blume & Felix Lim & A. Craig MacKinlay, . "The Declining Credit Quality of US Corporate Debt: Myth or Reality?," Rodney L. White Center for Financial Research Working Papers 3-98, Wharton School Rodney L. White Center for Financial Research.
- Theodore M. Barnhill & Marcos R. Souto & Benjamin M. Tabak, 2006. "An Analysis of Off-Site Supervision of Banks' Profitability, Risk and Capital Adequacy: a portfolio simulation approach applied to brazilian banks," Working Papers Series 117, Central Bank of Brazil, Research Department.
- Kwan, Simon H., 1996. "Firm-specific information and the correlation between individual stocks and bonds," Journal of Financial Economics, Elsevier, vol. 40(1), pages 63-80, January.
- Crouhy, Michel & Galai, Dan & Mark, Robert, 2001. "Prototype risk rating system," Journal of Banking & Finance, Elsevier, vol. 25(1), pages 47-95, January.
- repec:fth:pennfi:67 is not listed on IDEAS
- Helmut Elsinger & Alfred Lehar & Martin Summer, 2006.
"Risk Assessment for Banking Systems,"
INFORMS, vol. 52(9), pages 1301-1314, September.
- Marshall E. Blume & Felix Lim & A. Craig MacKinlay, . "The Declining Credit Quality of US Corporate Debt: Myth or Reality?," Rodney L. White Center for Financial Research Working Papers 03-98, Wharton School Rodney L. White Center for Financial Research.
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