High Quality Content by WIKIPEDIA articles! This is an alphabetical `list of countries by past and future Gross Domestic Product`, based on official exchange rates, not on the Purchasing Power Parity (PPP) methodology. Values are given in millions of United States dollars (USD) and have not been adjusted for inflation. These figures have been taken from the International Monetary Fund`s World Economic Outlook (WEO) Database, April 2011 Edition.