Oil Prices of us30 a barrel or more in first-quarter 2004 are swelling Opec producers' coffers,but key cartel strategists appear less than happy with the precipitous slide in the value of the dollar,the currency in which oil exports are priced.A December note issued by Opec gave early warning over the group's concern about"the decline in the purchasing power of the barrel as a result of US dollar weakness vis-a-vis other major currencies".
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