Think tanks are most common in the U.S. and also very widespread in Europe. Still they are an international phenomenon, with at least one or two such institutions in nearly every country of the world.
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The World Bank as well as the International Monetary Fund (IMF) originated during World War II in preparation for postwar international financial and economic cooperation. Initiated by the United States and Great Britain. The principal functions of the World Bank are to assist in the reconstruction and development of its member countries by facilitating capital investment for productive purposes, to promote private foreign investment by guarantees of and participation in loans and other investments made by private investors, and to make loans for productive purposes out of its own resources or funds borrowed by it when private capital is not available on reasonable terms.