A new report from Fitch Ratings finds that risk appetite is returning to the U.S. triparty repo market, thanks in part to deeply discounted collateral, much of which is in the form of Alt A and subprime residential MBS and collateralized debt obligations. Fitch’s study of the market is based on repo transaction information drawn from a sample of the 10 largest U.S. prime money market funds’ financial statements. Fitch’s sample encompasses about $90 billion in repo transactions as of the end of August 2011, which represents slightly more than 5 percent of the $1.6 trillion U.S. triparty repo market...