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Barrels, Bushels, and Bonds / Jeffrey Frankel, Project syndicate, 17/10/2011http://www.project-syndicate.org/commentary/frankel6/EnglishThe prices of hydrocarbons, minerals, and agricultural commodities have been on a veritable roller coaster. While commodity prices are always more variable than those for manufactured goods and services, commodity markets over the last five years have seen extraordinary, almost unprecedented, volatility...