This week the oil markets experienced something that used to be common but has become a rarity since the collapse of oil prices almost two years ago: major unexpected supply disruptions. It is not that there have been no disruptions since mid-2014, just that they have not mattered in a world awash in oil. But as the supply and demand curves continue to converge, geopolitical upheaval is moving the needle on oil prices again. The largest disruption, of course, came from Canada, where forest fires have torched large swathes of boreal forest near major oil sands operations […]