The Federal Reserve’s Open Market Committee, as expected, held the line on interest rates this week at its first meeting of 2017, but still presumably stayed on track for multiple increases later in the year. What’s new is a recent resurgence of talk about how the central bank will shrink its massive balance sheet and its huge portfolio of agency MBS and debt, perhaps as early as next year. “In view of realized and expected labor market conditions and inflation, the committee decided to maintain the target range for the federal funds rate at 1/2 to 3/4 percent,” the FOMC said. It added that committee members expect that economic conditions will evolve in a manner that will warrant only gradual increases in the federal funds rate. The Fed will...