Italy's five- and 10-year borrowing costs fell to their lowest level since May 2011 at an auction on Tuesday as big redemptions helped offset concerns about domestic political instability. Borrowing costs for the five-year paper came in at 3.8 percent, down from 4.09 percent at a similar sale one month ago. The treasury placed the maximum targeted amount of 4 billion euros of its new BTP bond maturing Nov. 2017. At the same time Rome sold 3 billion euros, also the top amount planned, of a 10-year bond with a yield of 4.92 percent, down from 5.24 percent on month ago. A weekend threat by former premier Silvio ... (full story)