"We are racing, and the question is how do we put barriers? So if a car was to fly out it doesn't kill people," IMF Managing Director Kristalina Georgieva said.

Federal Reserve Chairman Kevin Warsh said Friday he won't prejudge what the U.S. central bank will do about interest rates at its upcoming meetings in October and December.

The Federal Reserve chairman said technological change was complicating the outlook for central banks.

© Athit Perawongmetha/Reuters