Headquarters of the Rhenish-Westphalian Coal Syndicate, Germany (at times the best known cartel in the world), around 1910
The printing equipment company American Type Founders (ATF) explicitly states in its 1923 manual that its goal is to "discourage unhealthy competition" in the printing industry.

"Seven Sisters" was a common term for the seven transnational oil companies of the "Consortium for Iran" oligopoly or cartel, which dominated the global petroleum industry from the mid-1940s to the mid-1970s.

- Seven Sisters (oil companies)

The Seven Sisters was the name for the consortium of seven transnational oil companies which dominated the global petroleum industry from the 1940s to the 1970s. The contemporary equivalent is OPEC, an international organization of petroleum producing nations that sets production targets and prices among its members.

- Cartel
Headquarters of the Rhenish-Westphalian Coal Syndicate, Germany (at times the best known cartel in the world), around 1910

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OPEC

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Intergovernmental organization of countries.

Intergovernmental organization of countries.

OPEC Conference delegates at Swissotel, Quito, Ecuador, December 2010.
OPEC headquarters in Vienna
(2009 building).
An undersupplied US gasoline station, closed during the oil embargo in 1973.
A woman uses wood in a fireplace for heat. A newspaper headline in the foreground shows a story regarding a lack of heating oil in the community.
Fluctuations of OPEC net oil export revenues since 1972
One of the hundreds of Kuwaiti oil fires set by retreating Iraqi troops in 1991
Fluctuations of Brent crude oil price, 1988–2015
OPEC members' net oil export revenues, 2000–2020
Countries by net oil exports (2008).
Countries by oil production (2013)
Gusher well in Saudi Arabia: conventional source of OPEC production
Shale "fracking" in the US: important new challenge to OPEC market share
Logo for JODI, in which OPEC is a founding member.
Sulfur content and API gravity of different types of crude oil.

, the 13 member countries accounted for an estimated 44 percent of global oil production and 81.5 percent of the world's "proven" oil reserves, giving OPEC a major influence on global oil prices that were previously determined by the so-called "Seven Sisters" grouping of multinational oil companies.

Economists have characterized OPEC as a textbook example of a cartel that cooperates to reduce market competition, but one whose consultations are protected by the doctrine of state immunity under international law.