MBS are likely to be hurt when the Federal Reserve stops its reinvestments to shrink its balance sheet over the next few years, according to an analysis by Desjardins, Canada’s largest cooperative financial group. Even though the agency plans to withdraw gradually, its $1.75 trillion in MBS holdings account for approximately 20 percent of all U.S. MBS outstanding, noted Mathieu D’Anjou, senior economist with the Desjardins Group. “An increase in rate spreads between MBS and U.S. bonds, [which is] currently low, could be required...