Maurice Obstfeld, Economic Counsellor and Director of Research at the International Monetary Fund (IMF), speaks on the newly-released World Economic Outlook in Washington D.C., the United States, April 17, 2018. The International Monetary Fund on Tuesday kept its growth forecasts for the world economy unchanged for this year and next year, but warned that a potential broad-based trade conflict threatens to derail global growth prematurely. (Xinhua/Yang Chenglin)