The prisoner's dilemma reveals that A. nonprice competition is more profitable than price competition. B. the price leadership model does not work. OC. sometimes when individuals act independently in their own self-interest, everyone is worse off than if they had cooperated. OD. collusive agreements will always fail.All of the following are a fundamental characteristic of oligopoly except A. horizontal mergers. B. barriers to entry. OC. economies of scale. D. a homogeneous product