Credit quality for global structured finance securities fell for the sixth consecutive year in 2012, again led by U.S. residential MBS, according to Standard & Poor’s. Looking at downgrade and default trends from 1978 through 2012, S&P found that downgrades were less pervasive last year than in previous years. Nonetheless, the mild but slow global economic recovery continues to hurt the performance of MBS and other structured finance securities for the sixth straight year. Its lagging effect means that credit quality may continue to see moderate deterioration, the rating agency said. While poor credit quality appears...