Brent oil prices could tumble more than 20% by 2018, as U.S. output surges and adds renewed pressure on an oil market that is already battling with a persistent oversupply, according to Ian Taylor, chief executive officer at Vitol Group, the world’s largest oil trader. Speaking at the Oil & Money conference in London on Wednesday, Taylor warned that there’s currently a consensus in the industry that prices will go higher, but that such an unanimity “can be dangerous.” “We are all expecting a little bit of tightening to come through because we all see demand growing next year at a pretty good rate, we all expect OPEC ... (full story)