David Kocieniewski
New York Times
By controlling warehouses, pipelines and ports, banks gain valuable market intelligence, investment analysts say. That, in turn, can give them an edge when trading commodities. In the stock market, such an arrangement might be seen as a conflict of interest — or even insider trading. But in the commodities market, it is perfectly legal. In 2011, an internal Goldman memo suggested that speculation by investors accounted for about a third of the price of a barrel of oil.
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