With it looking more likely that the GSEs could survive in some form, a critic of Fannie Mae and Freddie Mac has proposed changes he suggests would address most of the flaws he sees in the companies. Mark Calabria, director of financial regulation studies at the Cato Institute, a libertarian think tank, said he offered the suggestions “in the spirit of lively debate.” He suggested that the federal government should open GSE charters to competition, allowing any firm that can meet the requirements to receive a GSE charter. Calabria said GSEs should have a capital requirement of at least 8.0 percent. Capital of 4.0 percent to 5.0 percent would have covered the losses Fannie and Freddie experienced in 2007, according ...