Few would dispute the importance of petroleum to the world economy. In fact, some argue that in 1991 the United States and its allies fought a war in the Persian Gulf over this liquid that, at current prices, cost less than half a cent per fluid ounce and doesn't even smell all that good. Imagine the lengths one might go to protect access to a liquid that, in some cases, cost over $100 per ounce-20,000 times the cost of crude petroleum. Wars may be fought again-advertising wars- this time to claim a portion of the international perfume market, which, according to Smithsonian magazine, has sales of $10 billio