Today’s reduced liquidity is here to stay because of increased regulation and the unprecedented dominance of the Federal Reserve in the agency MBS market, said the Urban Institute. The top five dealers were responsible for about 55 percent of agency-MBS transactions in 2006, but today’s top five account for approximately 80 percent, Urban Institute analysts said. According to Inside MBS & ABS estimates, the Fed held 27.3 percent of outstanding agency single-family MBS ...