"Catching a falling knife can be done but it's dangerous. There's a lot of knife catching going on ... People feel this might be enough. That confidence might be misplaced," he said.
"The path of this scourge is unknown therefore you can't know the economic impact. You can roll the dice but it's a guess." At 2:43PM ET, the Dow Jones Industrial Average fell 620.2 points, or 2.3%, to 26,337.39, the S&P 500 lost 69.71 points, or 2.24%, to 3,046.68 and the Nasdaq Composite dropped 222.84 points, or 2.48%, to 8,757.94.
All of the 11 S&P sectors were trading lower with real estate, technology and energy sectors all losing more than 3%.