OPEC is an organization formed in 1960 by 12 oil producing countries to unify their petroleum policies and coordinate production. Before OPEC, oil prices were controlled by major oil companies. OPEC took control of prices in the 1970s and was able to influence the global oil market as a cartel by restricting production to raise prices. As a cartel, OPEC aimed to allocate production quotas to stabilize prices. However, internal disagreements and increased non-OPEC production have weakened OPEC's influence in recent decades. The future of OPEC as an effective cartel remains uncertain.

1. OPEC THE ECONOMICS OF CARTEL

6. Difference in Price and output under Cartel

7. Price, Output & Profit Determination in Cartel