Blume, M.E.; Lim, F.; MacKinlay, A.C. - Rodney L. White Center for Financial Research, Wharton … - 1998
In recent years, the number of downgrades in corporate bond ratings has exceeded the number of upgrades, leading some to conclude that the credit quality of U.S. corporate debt has declined. However, an alternative explanation of this apparent decline in credit quality is that the rating...