Ben Bernanke, chairman of the U.S. Federal Reserve

Federal Reserve Chairman Ben Bernanke will always be remembered for saving Wall Street after the financial crash of 2008. But according to some analysts, his legacy will actually be dictated by the unwinding of the central bank's quantitative easing program (QE) and how that affects emerging markets.

Speculative capital flows, triggered by the Fed's ultra-loose monetary policy, is fast exiting emerging markets, confirming worries over the negative consequences of QE. This, according to the analysts at Bank of America Merrill Lynch, is Bernanke's "financial stability blackspot" which could alter how the central bank chairman could be perceived in the history books.