The Economist Guide to Commodities 2nd editionFrom aluminium and platinum to zinc and gold, oil and gas to cocoa and wheat, our lives are full of products derived or made from commodities the world's natural resources. We often take them for granted but at our peril, given the pivotal role these resources play in what we consume and produce. Price volatility, changing patterns of global demand, and geopolitical instability regularly expose how unpredictable the availability of and trade in