Janet Yellen And Christine Lagarde Speak At Institute For New Economic Thinking Conference

Christine Lagarde, managing director of the International Monetary Fund (IMF), speaks during an Institute for New Economic Thinking conference at the IMF headquarters with Janet Yellen, chair of the U.S. Federal Reserve, not pictured, in Washington, D.C., U.S., on Wednesday, May 6, 2015. Yellen said at the conference that policy makers still must be on guard against emerging risks to the financial system even after banks became more robust and less reliant on short-term borrowing to fund investments. Photographer: Andrew Harrer/Bloomberg via Getty Images