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The IMF, also known as the “Fund,” was conceived at a United Nations conference convened in Bretton Woods, New Hampshire, United States, in July 1944. The 44 governments represented at that conference sought to build a framework for economic cooperation that would avoid a repetition of the vicious circle of competitive devaluations that had contributed to the Great Depression of the 1930s.
The IMF’s responsibilities: The IMF's primary purpose is to ensure the stability of the international monetary system—the system of exchange rates and international payments that enables countries (and their citizens) to transact with one other. This system is essential for promoting sustainable economic growth, increasing living standards, and reducing poverty. Following the recent global crisis, the Fund has been clarifying and updating its mandate to cover the full range of macroeconomic and financial sector issues that bear on global stability

No one body or Government "owns" the IMF.