Crude oil spent most of the day in a trading range of $105 to $108 a barrel. The rise in crude oil prices and trading volatility came after oil exports from Iran were estimated to have dropped 300,000 barrels a day. The weaker U.S. Dollar also sent prices higher in Friday trading.
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http://www.foxbusiness.com/markets/2012/03/23/oil-prices-rise-sharply-on-drop-in-iranian-exports/
James Sutliff