The following post comes to us from John (Xuefeng) Jiang, Associate Professor of Accounting at Michigan State University; Mary Stanford, Professor of Accounting at Texas Christian University; and Yuan Xie, Assistant Professor of Accounting at Fordham University.
In our paper, Does It Matter Who Pays for Bond Ratings? Historical Evidence, forthcoming in the Journal of Financial Economics, we examine whether charging issuers for bond ratings is associated with higher credit ratings employing the historical setting wherein S&P switched from an investor-pay to an issuer-pay model in 1974, four years after Moody’s made the same switch.
Many commentators and policy makers claim that charging bond issuers for ratings introduces conflicts of interest into the rating process. For corporate bonds issued between 1971 and 1978, we find that, for the same bond, Moody’s rating is higher than S&P’s rating prior to 1974 when only Moody’s charges issuers. After S&P adopts the issuer-pay model in July 1974, the evidence indicates that S&P’s ratings increase to the extent that they no longer differ from Moody’s ratings. Because we use Moody’s ratings for the same bond as our benchmark, we can conclude that this increase in S&P’s ratings is not due to general changes affecting bond ratings.