 The day before the surprise OPEC crude-production decision, Lars Barstad, interim CEO of tanker owner Frontline NYSE: FRO, pointed to estimates that up to 1.5 million barrels per day bd of output might return. If so, that could lead tanker markets to tighten up quickly and be a trigger to sentiment ... and give owners the gumption to say, Rates are negative so Im going to hold back. 