Federal Reserve Chair Janet Yellen indicated this week that the central bank ultimately plans on holding few, if any, mortgage-related securities on its balance sheet. It seems unlikely there will be much in the way of actual sales of agency MBS by the Fed, which leaves run-off as the method of choice to drain the central bank’s portfolio. Delivering her semi-annual Humphrey-Hawkins testimony this week on Capitol Hill, the Fed chief said the FOMC intends to adjust its monetary policy during its normalization process mostly by changing its target range for the federal funds rate and not by actively managing its balance sheet. “The primary means of raising the federal funds rate will be to increase the rate of interest paid on excess reserves,” Yellen said. She also noted...