Vintage prime adjustable-rate mortgages went delinquent at a rate 30 percent higher when they were securitized privately, according to an economist with the Federal Reserve System. The study was based on mortgages originated in 2005 and 2006, at the height of the aggressive underwriting in the non-agency mortgage market. “We find that private-securitized loans perform worse than observably similar, non-securitized loans, which provides evidence for adverse selection ...