The Organization of the Petroleum Exporting Countries (OPEC) is a group of thirteen countries made up of Algeria, Angola, Ecuador (which rejoined OPEC in November 2007), Indonesia, Iran, Iraq, Kuwait, Libya, Nigeria, Qatar, Saudi Arabia, the United Arab Emirates, and Venezuela. The organization has maintained its headquarters in Vienna since 1965, hosting regular meetings between the oil ministers of its member states. According to its statute, the principal goal is the determination of the bes… (More on Opec)