Falling oil prices add nearly $400 million to forecast
If oil price drops too far, the picture gets bleak
Ultimate impact will be determined by the length and severity of price declines, and spillovers to the broader economy
BMO report looks at potential winners and losers should oil prices remain near US$60
Drop could stimulate U.S. economy, curb Canadian government revenues
Global demand has not kept pace with strong oil production worldwide, leading to revised price assumptions
