The Federal Reserve’s move to reduce its purchases of agency mortgage-backed securities may eventually change the relative costs and benefits of financing new production through Fannie Mae, Freddie Mac and Ginnie Mae. “We’re in an environment where I think banks are going to get interested in at least the more attractive credit risks and holding those in portfolio,” said Mark Calabria, director of financial regulation studies at the libertarian Cato Institute in Washington, DC. “So, to me, the most important question going forward over the next two years for the MBS market is how much of this [new production] is going to make its way into MBS and how much will be held on balance sheets as whole loans.” Calabria predicted...