How can one month change the outlook of (professionals)? Did they use their name to drop prices so that they could loadup and then a month later use their name to drive up the price in order to sell? or are they throwing a curve ball and jacking up the prices to sell into because they know the worst is yet to come?

Oil Prices Tank as Goldman Says 'Sell' Commodities  04/12/11 - 01:59 PM EDT

Goldman Sachs recommended buying commodities  May 24, 2011, 8:34am EDT