Things are not so sweet for the sugar market. Prices have been tumbling and reached a six-year low on Monday on news that Brazil's cane growers are in for a bumper harvest. But while gold made the headlines, the dramatic fall in the sugar price was widely overlooked, despite closing down 4.4pc, compared with a 2.3pc slump in the price of bullion. Over the past year alone, sugar prices have fallen by a quarter. So why has everything turned sour? Bumper Harvest Monday's sharp price drop was driven by signs that Brazil, the world's biggest producer of sugar, is on...