Fitch Ratings recently released new loan-loss model criteria for jumbo mortgage-backed securities. The rating service said the new loss criteria could result in higher credit enhancement requirements for new jumbo MBS. The new criteria assign a penalty to loans sourced through non-retail channels. The rating service will now include a borrower’s liquid reserves as a variable in its loss modeling. Fitch will apply a 25 percent haircut to the reported reserve amount based on the volatility ... [Includes five briefs]