Economists of the International Monetary Fund (IMF) attend a news conference on the updated World Economic Outlook (WEO), a twice-yearly flagship report, in Washington D.C., capital of the United States, Jan. 23, 2013. The IMF said Wednesday that the world economy stands poised for a gradual upturn in 2013 with output rising by 3.5 percent. (Xinhua/Wang Yiou)