FILE - In this Aug. 22, 2014 file photo Federal Reserve Chair Janet Yellen, right, and European Central Bank President Mario Draghi walk together during the Jackson Hole Economic Policy Symposium at the Jackson Lake Lodge in Grand Teton National Park near Jackson, Wyo. In a significant event for the global economy, the central banks of Europe and the United States are set to take opposing actions in December _ the European Central Bank to cut rates, the Federal Reserve to raise them. (AP Photo/John Locher, file)