Six years after central banks flooded the global economy with easy money in a process dubbed quantitative easing, concerns over investor complacency and low levels of volatility are surfacing. In October, the Financial News Volatility and Trading Survey found volatility would not return to "normal" levels for at least another year, while one in five respondents predicted it would take longer than two years. Last month, Financial News gathered a panel of experts for a roundtable discussion on the key concerns in making investment and trading decisions in a climate of central bank intervention and historically low interest rates. The following is an edited version of that discussion. . The full results of the Volatility and Trading Survey can be found here.