Oil prices have fallen to a four-year low due to a surprise output increase by OPEC+ and escalating global trade war. Brent prices are down 13% in two days - heading below $65 a barrel. Prices for other commodities are also dropping. Bloomberg's Will Kennedy reports from London. -------- More on Bloomberg Television and Markets Like this video? Subscribe and turn on notifications so you don't miss any videos from Bloomberg Markets & Finance: https://tinyurl.com/ysu5b8a9 Visit http://www.