Choi Kyu Yun, standing commissioner of South Korea&#39;s Financial Services Commission, speaks at a briefing in Seoul, South Korea, on Wednesday, Feb. 23, 2011. Deutsche Bank AG was banned from proprietary stock and derivatives trading for six months in South Korea after regulators blamed the firm for triggering a stocks rout that wiped out $26 billion in market value. Photographer: SeongJoon Cho/Bloomberg via Getty Images