There is no more premium for safe, liquid U.S. government debt, pushing the neutral level of interest rates higher, Federal Reserve Governor Christopher Waller told a Reuters NEXT Newsmaker event on Thursday. Waller also told Reuters NEXT that for the United States to grow its way out of a $40 trillion debt load, structural deficits would have to be brought closer to zero percent of GDP, from this fiscal year’s level of around 6%. Waller said that yields have been rising due to concerns…