In 1948, the OECD originated as the Organisation for European Economic Co-operation (OEEC), led by Robert Marjolin of France, to help administer the Marshall Plan (which was rejected by the Soviet Union and its satellite states). This would be achieved by allocating United States financial aid and implementing economic programs for the reconstruction of Europe after World War II. (Similar reconstruction aid was sent to the war-torn Republic of China and post-war Korea, but not under the name "Marshall Plan".)
In 1961, the OEEC was reformed into the Organisation for Economic Co-operation and Development by the Convention on the Organisation for Economic Co-operation and Development and membership was extended to non-European states.
The OECD's headquarters are at the Château de la Muette in Paris, France. The OECD is funded by contributions from member states at varying rates, and had a total budget of €363 million in 2015.
The Organisation for European Economic Co-operation (OEEC) was formed in 1948 to administer American and Canadian aid in the framework of the Marshall Plan for the reconstruction of Europe after World War II. It started its operations on 16 April 1948, and originated from the work done by the Committee of European Economic Co-operation in 1947 in preparation for the Marshall Plan. Since 1949, it was headquartered in the Château de la Muette in Paris, France. After the Marshall Plan ended, the OEEC focused on economic issues.
In the 1950s, the OEEC provided the framework for negotiations aimed at determining conditions for setting up a European Free Trade Area, to bring the European Economic Community of the six and the other OEEC members together on a multilateral basis. In 1958, a European Nuclear Energy Agency was set up under the OEEC.