International Monetary Fund and World Bank Group Annual Meetings

Mario Draghi, president of the European Central Bank (ECB), left, greets Haruhiko Kuroda, governor of the Bank of Japan (BOJ), during 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