Investors in nonprime MBS may be more vulnerable to fraudulent or defective mortgages compared to prime transactions because of deficiencies or inadequacies in the related representation-and-warranties frameworks, according to a new report from analysts at Moody’s Investors Service. “The collateral backing these transactions is riskier than the loans in post-crisis prime jumbo RMBS, which also generally use stronger frameworks,” the report said. For starters, “Transactions in the re-emerging non-prime RMBS sector are...