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Robert Zoellick, president of the World Bank, speaks at a news conference during the IMF and World Bank annual spring meetings in Washington, D.C., U.S., on Thursday, April 19, 2012. Zoellick said Argentina's decision to nationalize oil producer YPF SA was a 'mistake' and the 'wrong thing to do.' Photographer: Andrew Harrer/Bloomberg via Getty Images

Robert Zoellick, president of the World Bank, speaks at a news conference during the IMF and World Bank annual spring meetings in Washington, D.C., U.S., on Thursday, April 19, 2012. Zoellick said Argentina's decision to nationalize oil producer YPF SA was a 'mistake' and the 'wrong thing to do.' Photographer: Andrew Harrer/Bloomberg via Getty Images