Experts Laud FHFA’s Plan for ‘Single Security,’ But Urge Quicker Arrival at Goal. The Federal Housing Finance Agency’s “single security” proposal for a generic Fannie Mae/Freddie Mac MBS is “well-thought out” and “worthy of serious consideration,” but the agency should pick up the pace in its implementation to avoid making the solution part of the problem, according to a paper from the Urban Institute. Lewis Ranieri, chairman of Ranieri Partners, and Laurie Goodman, director of the UI’s Housing Policy Center, expressed concern that the FHFA “may be contemplating a slower pace in the project than it warrants.”