International organization founded in 1961 to stimulate economic progress and world trade. Based in Paris, the OECD serves as a consultative assembly and a clearinghouse for economic data, and it also coordinates economic aid to developing countries. Its members include Australia, Austria, Belgium, Canada, the Czech Republic, Denmark, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Japan, Luxembourg, Mexico, The Netherlands, New Zealand, Norway, Poland, Portugal, South Korea, Spain, Sweden, Switzerland, Turkey, the U.K., and the U.S