The primary conflict of interest at Moody's is well known: The company is paid by the same "issuers" (banks and companies) whose securities it is supposed to objectively rate. This conflict pervades every aspect of Moody's operations, Harrington says. It incentivizes everyone at the company, including analysts, to give Moody's clients the ratings they want, lest the clients fire Moody's and take their business to other ratings agencies.

Moody's analysts whose conclusions prevent Moody's clients from getting what they want, Harrington says, are viewed as "impeding deals" and, thus, harming Moody's business. These analysts are often transferred, disciplined, "harassed," or fired.

In short, Harrington describes a culture of conflict that is so pervasive that it often renders Moody's ratings useless at best and harmful at worst.