n an oligopoly market, collusion between firms usually leads to higher profits than does noncooperative behavior. Howeve r, formal, overt collusion doesn't usually occur in the United States because: I. it is illegal. II. there is an incentive for each firm to cheat on a collusive agreement. III. an oligopolistic firm will typically prefer lower profits for itself if the onl y way to make higher collective profits in the industry is to improve the profit position of its rivals