Co-operative oligopoly is the oligopoly in which firms might decide to collude together and not to compete with each other. Thus, in such a case the firms would behave as a signle monopoly and aim at maximising their collective profits rather than their individual profits.
On the other hand, non-cooperative oligopoly is the oligopoly where each firm aims at maximising its own profits and decides how much quantity to produce assuming that the other firms would not change their quantity supplied.
