We test if issuers of asset- and mortgage-backed securities receive rating favors from agencies with which they maintain strong business relationships. Controlling for issuer fixed effects and a large set of credit risk determinants, we show that agencies publish better ratings for those issuers...

This paper tests for conflicts of interest in the rating process of 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...