http://www.articleheaven.net en-us editorial@articlealley.com Prices for Oil are very volatile and change each and every second. What causes the crude prices to change so frequently? We will try and find answer to this question in this discussion. To begin with let us understand why crude oil is so expensive or w... http://www.articleheaven.net/the-crude-oil-price-story-2044078.html 17th February 2011