It has been a puzzle why foreign firms obtain credit ratings by global rating agencies such as S&P or Moody's rather than from their home country's rating agencies even though the global raters typically assign lower credit ratings when these foreign firms issue bonds in their home currencies....

We test the biasedness of unsolicited ratings relative to solicited ratings using the ex post firm performance measured by the long-run stock performance of firms following rating announcements and changes. We find that the announcements of new unsolicited ratings are followed by negative...