Of which Azerbaijan, Norway, Russia, the United Kingdom, Canada, Mexico, the United States, Oman Yemen, Angola, Equatorial Guinea, Brazil, Ecuador, East Timor, Australia, Brunei and Kazakhstan are not members.
Please compare and contrast proven reserves and wellhead extraction cost in those countries to those in the Middle East
Or simply note OPEC has 2/3 of the world proven reserves and provides 50% of it's oil exports. That's pricing power. Except apparently if you live in Couloir fantasy land. Sure there are market forces at work. To describe the oil industry landscape as a free market is farcical.