Mapping Systemic Risk in the International Banking Network (Garratt R., Mahadeva L., Svirydzenka K.)

Contagion in Banking Foreign Banks Information Asymmetry and Transparency Risk-taking and Risk Management

Abstract Systemic risk among the network of international banking groups arises when financial stress threatens to criss-cross many national boundaries and expose imperfect international co-ordination. To assess this risk, we apply an information theoretic map equation due to Martin Rosvall and Carl Bergstrom to partition banking groups from 21 countries into modules. The resulting modular structure reflects the flow of financial stress through the network, combining nodes that are most closely related in terms of the transmission of stress. The modular structure of the international banking network has changed dramatically over the past three decades. In the late 1980s four important financial centres formed one large supercluster that was highly contagious in terms of transmission of stress within its ranks, but less contagious on a global scale. Since then the most influential modules have become significantly smaller and more broadly contagious. The analysis contributes to our understanding as to why defaults in US sub-prime mortgages had such large global implications.
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Libref/ Garratt R., Mahadeva L., Svirydzenka K. (2011) "Mapping Systemic Risk in the International Banking Network", Bank of England Working Paper No. 413, pp. 1 - 41
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