Major post-crisis changes in the mortgage market should boost new issuance of residential MBS and have a long-lasting, positive impact on credit, according to Moody’s Investors Service. The rating service cites three key developments that will continue to support a strong credit environment for new MBS issuance, starting with the final rule on ability to repay and qualified mortgages. Moody’s believes the rule will help MBS performance by improving the reliability and accuracy of data lenders use to underwrite loans. Under the ATR rules, lenders are required...