The Credit Ratings Game
AbstractThe spectacular failure of top-rated structured finance products has brought renewed attention to the conflicts of interest of Credit Rating Agencies (CRAs). We model both the CRA conflict of understating credit risk to attract more business, and the issuer conflict of purchasing only the most favorable ratings (issuer shopping), and examine the effectiveness of a number of proposed regulatory solutions of CRAs. We find that CRAs are more prone to inflate ratings when there is a larger fraction of naive investors in the market who take ratings at face value, or when CRA expected reputation costs are lower. To the extent that in booms the fraction of naive investors is higher, and the reputation risk for CRAs of getting caught understating credit risk is lower, our model predicts that CRAs are more likely to understate credit risk in booms than in recessions. We also show that, due to issuer shopping, competition among CRAs in a duopoly is less efficient (conditional on the same equilibrium CRA rating policy) than having a monopoly CRA, in terms of both total ex-ante surplus and investor surplus. Allowing tranching decreases total surplus further. We argue that regulatory intervention requiring upfront payments for rating services (before CRAs propose a rating to the issuer) combined with mandatory disclosure of any rating produced by CRAs can substantially mitigate the conflicts of interest of both CRAs and issuers.
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Date of creation: Feb 2009
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Other versions of this item:
- Patrick Bolton & Xavier Freixas & Joel Shapiro, 2009. "The credit ratings game," Economics Working Papers 1149, Department of Economics and Business, Universitat Pompeu Fabra.
- Patrick Bolton & Xavier Freixas & Joel Shapiro, 2010. "The Credit Ratings Game," Working Papers 468, Barcelona Graduate School of Economics.
- Patrick Bolton & Xavier Freixas & Joel Shapiro, 2010. "The credit ratings game," Economics Working Papers 1221, Department of Economics and Business, Universitat Pompeu Fabra.
- D43 - Microeconomics - - Market Structure and Pricing - - - Oligopoly and Other Forms of Market Imperfection
- D82 - Microeconomics - - Information, Knowledge, and Uncertainty - - - Asymmetric and Private Information; Mechanism Design
- G24 - Financial Economics - - Financial Institutions and Services - - - Investment Banking; Venture Capital; Brokerage
- L15 - Industrial Organization - - Market Structure, Firm Strategy, and Market Performance - - - Information and Product Quality
This paper has been announced in the following NEP Reports:
- NEP-ALL-2009-02-22 (All new papers)
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Blog mentionsAs found by EconAcademics.org, the blog aggregator for Economics research:
- Credit rating inflation and naive investors
by Economic Logician in Economic Logic on 2009-04-03 02:26:00
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