One of Europe's most influential economists has warned that the quantitative easing measures seen being unveiled by the European Central Bank (ECB) this week could create deep market volatility, akin to what was seen after the Swiss National Bank abandoned its currency peg. "There was so much capital flight in anticipation of the QE to Switzerland, that the Swiss central bank was unable to stem the tide, and there will be more effects of that sort," the President of Germany's Ifo Institute for Economic Research, Hans-Werner Sinn, told CNBC on Monday. Read MorePrepare for a 'mini-drop' in volatility this week This ... (full story)