Italy's cost of borrowing increased after the country sold 567 million euros of inflation-indexed government bonds that mature in 2023. The gross yield of bonds is 7.30% as compared to 2.90% in previous auction in March 2010. The rapid increase in the bond yields raise fears that the third-largest economy in Europe will seek another bailout. More significant test will be on Tuesday when Italy tries to sell 8 billion euros in government bonds.