China's currency devaluation should give a shot in the arm to global foreign exchange volumes as traders take advantage of and protect themselves against the surprise surge in volatility, but its longer-term impact on market activity may not be so benign. Investors with longer-term horizons than a day's trading profit, from pension funds seeking stable returns to companies considering expanding overseas, will be alarmed by the prospect of wild swings in exchange rates triggered by another round of "currency wars". Former Brazilian finance minister Guido Mantega coined the term "currency wars" in 2010. It refers to ... (full story)