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“If a Wall Street trader bets that oil will hit $80 a barrel, that bet influences how other traders bet. Someone’s likely to up the ante … ‘It’s a self-fulfilling prophecy…’ Greenberger says. Left unchecked, it’s a one-way ratchet. tyt.com/stories/4vZLCHuQrYE4uKagy0oyMA/53PsQvIKiZFzQPRRk91p2q