Multiple Ratings and Credit Standards: Differences of Opinion in the Credit Rating Industry

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Multiple Ratings and Credit Standards: Differences of Opinion in the Credit Rating Industry

April 1996 Number 12

JEL classification: G11, G12, G23

Authors: Richard Cantor and Frank Packer

Rating-dependent financial regulators assume that the same letter ratings from different agencies imply the same levels of default risk. Most 'third' agencies, however, assign significantly higher ratings on average than Moody's and Standard & Poor's. We show that, contrary to the claims of some rating industry professionals, sample selection bias can account for at most half of the observed average difference in ratings. We also investigate the economic rationale for using multiple rating agencies. Among the many variables considered, only size and bond-issuance history are consistently related to the probability of an issuer seeking third ratings. The probability ties to improve their standing under rating-dependent regulations.

Available only in PDF PDF

44 pages / 2,740 kb

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