An illustration of Chinese currency 100 yuan notes issued by the People’s Bank of China, fronted with an image of former Communist party leader Mao Zedong and on the rear, the parliament building Great Hall of the People, on November 12, 2010 in Beijing. A senior US official speaking at the G20 summit in Seoul said the United States is “very encouraged” by China’s progress in allowing the yuan to rise, despite “heat” and public rows with Beijing over exchange rates. The Chinese currency has appreciated by about two percent against the dollar since Beijing pledged in June to allow it to trade more freely but China has warned that any sudden rise in the value of the unit would pummel its businesses and trigger massive unemployment. AFP PHOTO/Frederic J. BROWN (Photo credit should read FREDERIC J. BROWN/AFP/Getty Images)