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Haruhiko Kuroda, governor of the Bank of Japan (BOJ), from left, Mario Draghi, president of the European Central Bank (ECB), and Janet Yellen, chair of the U.S. Federal Reserve, attend the Group-of-20 (G-20) finance ministers and central bank governors group photograph on the sidelines of the International Monetary Fund (IMF) and World Bank Group Spring Meetings in Washington, D.C., U.S., on Friday, April 11, 2014. As the International Monetary Fund declares the strengthening U.S. economy is providing a 'major impulse' to the world, economists are questioning just how powerful it will prove to be. Photographer: Andrew Harrer/Bloomberg via Getty Images

Haruhiko Kuroda, governor of the Bank of Japan (BOJ), from left, Mario Draghi, president of the European Central Bank (ECB), and Janet Yellen, chair of the U.S. Federal Reserve, attend the Group-of-20 (G-20) finance ministers and central bank governors group photograph on the sidelines of the International Monetary Fund (IMF) and World Bank Group Spring Meetings in Washington, D.C., U.S., on Friday, April 11, 2014. As the International Monetary Fund declares the strengthening U.S. economy is providing a 'major impulse' to the world, economists are questioning just how powerful it will prove to be. Photographer: Andrew Harrer/Bloomberg via Getty Images