Fannie Mae’s Looser Restrictions are Criticized
Fannie Mae has some looser government restrictions than other financial institutions do.
According to Wikipedia, they can sell mortgage-backed securities with only half of the normal money backing them up. But it’s not really justified to allow this because Fannie Mae offers no real guarantee, even though it might seem like one exists because of their ties to the government.
Critics, including Alan Greenspan, say that the risk is artificially lowered.