Brent crude fell below $80 a barrel for the first time in four years on speculation that OPEC won’t eliminate a global supply glut. Brent, used to price more than half the world’s oil, last traded below $80 on Sept. 29, 2010. The Organization of Petroleum Exporting Countries (OPEC) won’t cut its collective output when it meets in Vienna on Nov. 27, according to Kuwaiti Oil Minister Ali Al-Omair.