NEW YORK (Reuters) -Federal Reserve Governor Christopher Waller said on Tuesday that he believes the private sector should take the lead when it comes to payment sector innovations. "What is the fundamental market inefficiency that would be solved by government intervention and can only be solved by government intervention?" Waller asked, noting that "if there isn't a satisfactory answer, then I believe government shouldn't intervene in private markets." Waller did not comment on the monetary policy and economic outlook in his prepared remarks, which centered on the role the Fed plays in the payment system.