The recent performance of prime jumbo RMBS from 2005-2007 suggests average losses on the securities might be about three or more times what was previously expected, but there appears to be some hope government initiatives could still make a difference, according to Fitch Ratings.

Fitch said it "will continue to assess the range of potential impacts of government housing stabilization efforts on nonagency prime RMBS" and also will "continue to closely monitor other potential mitigants to performance deterioration, such as federal financial stability efforts."

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