Olivier Blanchard, chief economist of the International Monetary Fund (IMF), center, talks to Janet Yellen, chair of the U.S. Federal Reserve, right, during the International Monetary Fund Committee (IMFC) governors plenary session at the International Monetary Committee (IMF) and World Bank Group Spring Meetings in Washington, D.C., U.S., on Saturday, April 18, 2015. IMF Managing Director Christine Lagarde warned this week that she wouldn't let Greece skip a debt payment to the lender, shutting down a potential avenue to buy the Greek government some financial leeway. Photographer: Andrew Harrer/Bloomberg via Getty Images
