[Their plan would] abolish the most toxic features of the old “government-sponsored enterprise” model. In particular, the plan would get Fannie and Freddie out of the business of directly purchasing mortgage-backed securities, which was highly profitable to them in large part because their implicit government guarantee enabled them to fund a large portfolio at artificially low rates. Their existing $5 trillion pile of securities and guarantees would be wound down or sold off to the private sector.
But Mr. Marron and Mr. Swagel would keep a government role in Fannie and Freddie’s other business: securitizing conventional, moderately sized “conforming loans,” which is both necessary to mortgage liquidity and relatively less risky. And instead of a non-transparent, implicit government guarantee, the new securities would carry an explicit one, for which the securitizers would pay a fee. Accumulated fees, in turn, would cover losses, thus shielding taxpayers. To promote innovation and competition, this business would be open not only to Fannie and Freddie but to any other well-capitalized financial institution capable of taking it on.