How is OPEC a multilateral oligopoly?

OPEC is a collection of oil exporting countries. Oligopoly - Industry that is controlled by a few major players (firms or countries) Collusion - When industry leaders secretly agree to limit quantities of production. This will guarantee the colluders a higher price for their product OPEC meet to discuss the quantity of oil they will allow onto the world market. This is collusion. Because the OPEC members are the main suppliers of oil they are said to be an oligopoly