Currency trading may have risen to a record $5 trillion a day in September, surpassing the peak reached before Lehman Brothers (LEHMQ) Holdings Inc.’s collapse in 2008, according to the Bank for International Settlements. Trading then declined to about $4.7 billion a day in October and is likely to have fallen considerably in early 2012, the Basel, Switzerland-based bank said in a report. The BIS said it derived its estimates from supplementing the data in its foreign-exchange survey, which is undertaken every three years, with information collected from central banks and electronic- trading platforms. The surveys ... (full story)