Global bond yields hit 2008 highs, raising stakes for big borrowers ↧ ↧ Global bond yields hit 2008 highs, raising stakes for big borrowers Government borrowing costs hit their highest since the 2008 financial crisis on Tuesday, with 10-year U.S. Treasury yields now above 5%, increasing pressure on heavily ​indebted borrowers that so far have been shielded by resilient economic growth.