Economist Lawrence Lindsey says the Fed has boxed itself and has little choice but to keep interest rates low. Borrowing at the more normal interest rates of 5.7%- which is what it was over the last three decades- and not at the current 2.5%, would mean an increase in borrowing costs for the U.S. government of $800 billion in 2021, says Lindsay. Lindsay bases this on the U.S. debt growing from $14 trillion in 2011 to $25 trillion by 2021, and interest rates going back to normal levels by 2021. Just to put this in perspective Lindsay says it would require all the cuts Republicans and Rep. Ryan are asking for just to pay for the added interest, not even about reducing the size of the U.S. debt. This would be a disaster for the U.S. Treasury, so we're stuck with really low rates. The term used by economists is "financial repression." Savers and retirees will have to put up with low returns. Lowering unemployment is only one aspect of U.S. Fed policy, the other aspect is in the constraints Bernake faces....