“ROBIN HARDING. Mr. Chairman, you’ve always argued that it’s the stock of assets that the Federal Reserve holds which affects long-term interest rates. How do you reconcile that with a very sharp rise in real interest rates that we’ve seen in recent weeks? And do you think the market is correctly interpreting what you think is most likely to be the future path of the Federal Reserve’s stock of assets? Thank you. CHAIRMAN BERNANKE. Well, we were a little puzzled by that. It was bigger than can be explained I think by changes in the ultimate stock of asset purchases within reasonable ranges. So I think we have to conclude that there are other factors at work…”
http://www.economicpolicyjournal.com/2013/06/fed-chairman-bernanke-admits-fed-has-no.html