Which of the following may transform an industry from oligopoly to monopolistic competition?

Question

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When new firms enter an industry, the market becomes more competitive and the concentration of market power decreases. This can lead to a shift from an oligopoly market structure to one of monopolistic competition with many small firms competing. Takeovers, exit, and acquisition may increase concentration in the industry and lead to an oligopolistic market structure.

Which of the Following May Transform an Industry from Oligopoly