The Organisation for Economic Cooperation and Development is marking its 50th anniversary.
The west’s economics think-tank is celebrating at its Paris headquarters with 1,400 representatives from its 34 member countries.
The guest list also includes the leaders of Germany, France, Japan and Greece, US Secretary of State Hillary Clinton and European Commission President Jose Manuel Barroso.
The OECD, which officially came in being in 1961, grew out of the Organisation for European Economic Co-operation set up in 1947 to administer north American aid under the Marshall Plan for the reconstruction of Europe after World War II.
As part of its 50 year celebrations, the OECD has just launched a so-called “happiness index” to measure well-being and perceptions of living conditions saying that will help it “deliver better policies for better lives”.