The Organisation for Economic Co-operation and Development (OECD; French: Organisation de Coopération et de Développement Économiques, OCDE) is an intergovernmental economic organisation with 38 member countries, founded in 1961 to stimulate economic progress and world trade. It is a forum of countries describing themselves as committed to democracy and the market economy, providing a platform to compare policy experiences, seek answers to common problems, identify good practices and coordinate domestic and international policies of its members. The majority of OECD members are high-income economies with a very high Human Development Index (HDI) and are regarded as developed countries. As of 2017, the OECD member countries collectively comprised 62.2% of global nominal GDP (US$49.6 trillion) and 42.8% of global GDP (Int$54.2 trillion) at purchasing power parity. The OECD is an official United Nations observer.In 1948, the Organisation for European Economic Co-operation (OEEC), led by Robert Marjolin of France, was established 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. In 1961, the OEEC was reformed into 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 countries at varying rates and had a total budget of €386 million in 2019.The OECD is recognised as a highly influential publisher of mostly economic data through publications as well as annual evaluations and rankings of member countries.