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Discussion Paper Details

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Title: Structured Debt Ratings: Evidence on Conflicts of Interest

Author(s): Matthias Efing and Harald Hau

Publication Date: May 2013

Keyword(s): conflicts of interest, credit ratings, ratings inflation and structured debt

Programme Area(s): Financial Economics

Abstract: This paper tests for conflicts of interest in the rating process of European asset- and mortgage-backed securities based on a new aggregation method for a deal's different tranche ratings. Controlling for a large set of determinants of credit risk, we find that credit rating agencies provide better credit ratings for the structured products of those issuers that provide them with more overall bilateral rating business. This effect is particularly pronounced in the run-up to the subprime crisis and for structured products with the worst collateral. Rating favors to the largest clients generate economically significant competitive distortion, foster issuer concentration and contribute to the "too big to fail" status of large issuer banks.

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Bibliographic Reference

Efing, M and Hau, H. 2013. 'Structured Debt Ratings: Evidence on Conflicts of Interest'. London, Centre for Economic Policy Research. https://cepr.org/active/publications/discussion_papers/dp.php?dpno=9465