Bernanke assaults the dollar

[ArlJim78]

in addition to buying the Treasuries, they did say this;

"The Fed also said it will buy more mortgage-backed securities guaranteed by Fannie Mae and Freddie Mac to help that battered market. The central bank will buy an additional $750 billion, bringing its total purchases of these securities to $1.25 trillion. It also will boost its purchase of Fannie and Freddie debt to $200 billion"

I know the claim is that they will make money doing this, but isn't the problem that you can't determine what the correct price should be for these securities? so there is the risk is that they'll pay too much.