Four years after the credit crisis, analysts at Fitch Ratings expect eventual losses from structured finance transactions to soar from current levels, about $94 billion, or 2.7 percent of the original balance of rated transactions, to $376 billion, or 10.6 percent, by the time the dust settles. And the primary culprit, of course, is residential MBS. “Fitch expects a further 9,754 tranches to not recover their full principal, representing 33 percent of all tranches and increasing the proportion of tranches with realized or expected losses to 63 percent of the total...