填空题 Given their role in the 2008 meltdown, and their subsequent branding as toxic sludge, it is not surprising that "securitized" financial products have had a quiet few years. Yet the transformation of mortgages, credit-card debt and other recurring cash flows into new marketable securities is enjoying something of resurgence. Once apparently destined for the financial history books, the alphabet soup of ABSS (asset backed securities), MBSS (their mortgage version), CLOs (collateralized loan obligations) and others had a bumper year in 2013. More growth is expected next year.