(Front row L-R) Britain's President of t

(Front row L-R) Britain's President of the European Bank of Reconstruction and Development Thoma Mirow, EU commissioner for Internal Market and Services Michel Barnier, German Chancellor Angela Merkel and German Finance minister Wolfgang Schaeuble and (top row L-R) US' Adam Posen of the Peterson Institute for International Economics, Svein Andresen of the Financial Stability Board, South Korea's Financial Services commission chairman Dong Soo Chin, Norway's Finance minister Sigbjorn Johnsen and Finland's Finance minister Jyrki Katainen pose for a group picture during a conference on financial regulation on May 20, 2010 at the Finance Ministry in Berlin. Merkel said she would lead a campaign for a tax on financial markets at the next meeting of the Group of 20 developed economies in June 2010 and called for international support. AFP PHOTO DDP / MICHAEL KAPPELER GERMANY OUT (Photo credit should read MICHAEL KAPPELER/DDP/AFP via Getty Images)