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If investors needed another reason to distrust the stock market, here鈥檚 a doozy. A study by a trio of researchers in the U.S. and Canada into聽insider trading聽found that one-quarter of the big merger and acquisition (M&A) deals over a 15-year period鈥攔oughly 460 transactions in total鈥攎ay have seen people profiting on information before it was public.

...聽While the idea of corporate insiders whispering tips to their pals is almost a Wall Street clich茅鈥攐ne firmly grounded in reality, mind you鈥攖he full extent of the practice has, until now, never been quantified. The academics鈥敵扇薞R视频 economist聽Patrick Augustin聽along with two New York University professors, Menachem Brenner and Marti Subrahmanyam鈥攑ored over more than 1,850 U.S. M&A transactions between 1996 and 2012.聽

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