Organization of Petroleum Exporting Countries - (OPEC), multinational organization (est. 1960, formally constituted 1961) that coordinates petroleum policies and economic aid among oil-producing nations. Its Board of Governors and board chairperson are elected by member nations; OPEC's headquarters are in Vienna, Austria. Members consist of Algeria, Indonesia, Iran, Iraq, Kuwait, Libya, Nigeria, Qatar, Saudi Arabia, the United Arab Emirates, and Venezuela. Ecuador and Gabon suspended their memberships in 1992 and 1994, respectively. Saudi Arabia has traditionally dominated the organization, owing to its enormous oil reserves; the organization's members produce about 40% of the world's crude oil.

In 1973, as a result of the Arab oil embargo against Western nations who supported Israel during the Yom Kippur War (see Arab-Israeli Wars), OPEC was able to raise oil prices tremendously; the price hike caused inflation in oil-importing nations. Increases ensued from 1975 to 1980. However, as importing countries pursued alternate energy resources, OPEC was forced to lower prices by 1982. Oil prices remained low through most of the 1980s and 90s, with only a temporary hike during the Persian Gulf crisis of 1990–91 (see Persian Gulf War). With the cooperation of non-OPEC oil-exporting nations, OPEC was able to raise prices in 1999 by cutting production. As prices rose above $30 a barrel in early 2000, OPEC members agreed to increase production somewhat, cutting back production again a year later in an attempt to maintain prices. A worldwide economic slowdown caused oil prices to fall to near $20 by late 2001, but cutbacks by OPEC and non-OPEC nations, an economic rebound, and concern over how a war in Iraq would affect already short supplies subsequently caused prices to rise.

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