Nobel Laureate Edmund Phelps says it would be good to try out higher interest rates and that reopening coal mines in the U.S. wouldn't send a good signal to the rest of the world. Prior to that, Jens Nordvig, CEO of Exante Data, says if U.S. tax reform doesn't happen in the coming months, the dollar may drift weaker. Finally, Krishna Memani, Oppenheimerfunds' chief investment officer, says the core of the Fed under Jay Powell won't be dramatically different than under Janet Yellen.