Why is it challenging for firms in an oligopoly to sustain collusion?

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All of the above reasonsWhen new competitors join the oligopolyDue to antitrust regulations that prohibit collusionBecause individual firms' self-interest clashes with collective cooperation

Explanation

Collusion in an oligopoly is hard to maintain for several reasons: the entry of new firms disrupts agreements, antitrust laws forbid collusion, and the inherent conflict between self-interest and cooperation among firms. Therefore, all these factors contribute to the difficulty.