They still depend on moving tonnes cheaply. But with green energy changing demand, big producers must increasingly think like small ones. For companies like Rio Tinto and BHP that will require a change of mindset – and in some cases, leadership.
During the 2016 campaign, Donald Trump suggested the United States revisit the gold standard. So did his rivals Ted Cruz, Rand Paul and Ben Carson. Why are Americans so obsessed with the precious metal, both as a store of value and an investment? James Ledbetter swings by Times Square to discuss his new book, "One Nation Under Gold."