A distinguishing feature of an oligopolistic Industry is the tension between a Cooperation and self-interest.
What is an oligopoly?
An oligopoly is a market structure where there are few sellers. A seller is large enough to have an impact on the market in an oligopoly. Your competitors are responding to your decisions, but you must also respond to theirs.Unlike perfect competition, monopoly, and monopolistic competition, oligopoly necessitates strategic thinking.
There is a conflict between collaboration and self-interest in oligopoly marketplaces. If every company has the incentive to increase output when they limit their output since the cost is high.
The equilibrium of an oligopoly market is determined using game theory tools.
Therefore option b is correct.
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