Well, in fact they do it every day. Reserves from all over the world are projected, and paid for, sometimes months before the oil is actually pumped into barrels. <a href="http://www.eia.doe.gov/basics/quickoil.html" target="_blank">http://www.eia.doe.gov/basics/quickoil.html</a> Pay particular attention to the barrels of oil pumped per day versus the barrels of oil used per day. <!--Beg_Sig-->