Securitization experts are expecting a rerun of last year in 2012, as the U.S. economy slowly rights itself and most segments of the asset-backed securities market generate reasonable new issuance and stable performance. While observers suggest the housing market may make only modest improvement this year, no one expects much non-agency mortgage activity. Growth in issuance of non-agency mortgage-backed securities is going to be very slow, said Ron Mass, co-head of structured products at Western Asset Management Co. Because the market is underwriting the mortgage borrower, and no longer relying...