Vice-President Xi Jinping (R) speaks next to US Vice-President Joe Biden during a discussion with US and Chinese business leaders at Beijing Hotel in Beijing August 19, 2011. China and the United States "have a responsibility to strengthen macro-economic policy coordination and together boost market confidence," Xi told visiting Biden on Thursday. [Photo/Agencies]

US Vice-President Joe Biden listens to a speech by Vice-President Xi Jinping (not pictured) at a China-US Business Dialogue in the Beijing Hotel in Beijing August 19, 2011. [Photo/Agencies]