Janet Yellen, chairman of the US Federal Reserve, left, speaks with Mario Draghi, president of the European Central Bank, during the Jackson Hole economic

Janet Yellen, chairman of the US Federal Reserve, left, speaks with Mario Draghi, president of the European Central Bank, during the Jackson Hole economic

Janet Yellen, chairman of the US Federal Reserve, left, speaks with Mario Draghi, president of the European Central Bank, during the Jackson Hole economic

Janet Yellen, chairman of the US Federal Reserve, left, speaks with Mario Draghi, president of the European Central Bank, during the Jackson Hole economic