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In taking no action on production Thursday, OPEC did the opposite of what it usually does. Rather, the tactic made sense in light of an American shale boom that has put OPEC on the defensive. "OPEC is all in and will continue to flood the globe with oil in an effort to bury the US shale oil producer," said Phil Flynn, senior market analyst at the Price Futures Group. US oil prices tumbled more than $7 Friday, sinking to $66.15 a barrel, the lowest level since September 2009, following an OPEC meeting that one research firm called a "watershed" moment.