Oil Market Overreacting to Covid News, Analyst Sen Says Oil prices suffered one of the largest ever one-day plunges, crashing more than 11% on Black Friday as a new coronavirus strain sparked fears that renewed lockdowns will hurt global demand. The crash, the 7th largest ever for Brent crude, the global oil benchmark, may prompt the OPEC+ cartel to re-consider its policy when it meets next week, with the group increasingly leaning toward pausing its output hikes.