Economist and Bay Street veteran David Rosenberg says ongoing economy uncertainty could singlehandedly drag Canada's GDP to zero. He speaks on BNN Bloomberg. -------- More on Bloomberg Television and Markets Like this video? Subscribe and turn on notifications so you don't miss any videos from Bloomberg Markets & Finance: https://tinyurl.com/ysu5b8a9 Visit http://www.bloomberg.com for business news & analysis, up-to-the-minute market data, features, profiles and more. Connect with Bloomberg