A boom in ABS backed by unsecured consumer loans requires closer scrutiny, according to analysts at Fitch Ratings. Marketplace lenders have boosted the issuance of such ABS in recent years, though the rating service warned that deal performance is difficult to predict. “Many firms in this space have legitimate value propositions and apparent technological advantages,” Fitch said. “However, they have yet to prove their underwriting merit.” Since September 2013, at least 31 ABS totaling $4.60 billion backed by consumer loans from marketplace lenders have been issued...