The New York Mercantile Exchange began trading oil futures in nineteen eighty-three.

纽约商品交易所于1983年开始交易石油期货。

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The warning in 2005 was criticised as "self-serving" because Goldman Sachs is one of the largest Wall Street investment Banks trading oil and it could profit from an increase in prices.

外界批评他2005年发出的警告是“自私自利”，因为高盛是从事石油交易的大型华尔街投资银行之一，能够从油价上涨中获利。

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This concept is also used in the energy sector for electricity, oil, and gas trading.

这个概念同时也应用在电子，石油以及天然气交易的能源部门。

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Now, oil is trading for less than 40 dollars a barrel.

VOA: special.2009.01.03

For all those trading oil from minute to minute, they need reliable information on what's happening in the market.

BBC: Setting prices crudely

Others would argue that energy independence is the goal, and that trading oil imports for ethanol imports does little to achieve that.

FORBES: Implications Of The U.S. Ethanol Tariff

First to Venezuela, where President Hugo Chavez is trading oil for healthcare.

NPR: Cuban Doctors Staff Venezuela's Free Clinics