Bubble trouble for stocks? A Pakistani vendor is silhouetted as he forms bubbles at the Rawal Lake park in Islamabad on Feb. 27. (Aamir Qureshi, AFP/Getty Images)
It’s the question everyone wants answered: What will derail the mighty bull market? One Wall Street seer, who warns U.S. stocks are in a bubble, throws out three pins that could prick the bubble.
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