Some ETFs tied to commodities are among hedge funds' favorite investments. But others have generated controversy--and at least one lawsuit--over concerns that they could distort prices in the physical assets that back them.
Jan AlexanderNovember 5, 2012
Illustration by Mitch Blunt MICHAEL FARMER AND DAVID LILLEY KNOW A LOT ABOUT COPPER. They met when Farmer, 67, was running the largest copper trading firm in the world, Metallgesellschaft in Germany, and Lilley, 45, went
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