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Octobers during election years are often volatile

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History shows that market volatility surges in October during election years, and in the wake of a fiery first presidential debate between Hillary Clinton and Donald Trump, investors believe 2016 won't be any different.

"With the US election looming, geopolitical concerns continue to dominate as a key market risk," stated Barclays' "Global Macro Survey" report out this week to clients. "Investors seem convinced that the U.S. election campaign is likely to drive market volatility."

Using Kensho, an analytics tool deployed by hedge funds, CNBC PRO ran a study of the last six election years.