The jumbo MBS market is frozen because investors in the AAA tranches are scarce and still lack confidence in the product following the housing bust and the ensuing tidal wave of litigation swamping issuers and underwriters. According to MBS pioneer Lewis Ranieri, there’s only one to fix the problem: give investors more information on the deals. At a speech this week during the annual convention of the Mortgage Bankers Association, Ranieri, the chairman and CEO of Shellpoint Partners, noted...