| http://www.w3.org/ns/prov#value | - Prices for immediate delivery have traded at a discount to later ones for 17 straight sessions, the longest stretch since the end of 2010, exchange data show.The last day of trading for the August contract, July 16, the discount to September futures was $1.32 a barrel, prompting firms including Bank of America Corp. and Energy Aspects Ltd. to speculate it would be profitable for traders to buy cru
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