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The data for gross domestic product, or GDP, is compiled by statistical governmental agencies in each country and is aggregated and presented as one figure, usually once a quarter. International organizations collect GDP data from each country's agency and then present it in a convenient form in their databases. The most reliable resources to obtain nominal GDP data are the World Bank and the International Monetary Fund, or IMF. The U.S. Federal Reserve also collects GDP and makes it available; however, the data series are not always complete. The Organization for Economic Cooperation and Development, or OECD, also tracks GDP data.

In economics, GDP is one of the most important economic indicators and measures an aggregate production within a country as the sum of gross values added for all economic agents operating within a country. There is a real and nominal GDP. Nominal GDP calculates the aggregate value added based on current prices; therefore, it incorporates inflation. Real GDP measures aggregate value adjusted for changes in prices.

The World Bank hosts one of the most reliable Web-based databases. It has one of the best and most comprehensive list of countries for which it tracks GDP data. The IMF also provides GDP data through its multiple databases, such as World Economic Outlook and International Financial Statistics.

The U.S. Federal Reserve collects data from multiple sources, including a country's statistical agencies and the World Bank. The only drawback to using a Federal Reserve database is a lack of updating in GDP data and an absence of data for certain countries. Another highly reliable source of GDP data is OECD. The OECD provides not only historical data but also forecasts for GDP growth. The disadvantage of using the OECD database is that it tracks only OECD member countries and a few nonmember countries.

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