If a monopoly firm suddenly lost its barriers to entry and faced new competition, yet consumers thought that the former monopoly’s products were somewhat different than its new competitors, then the industry has probably become a monopolistically competitive industry.
As given that the former monopoly’s products were somewhat different than its new competitors, thus it is clear that supernormal profits in the case of the monopoly has attracted various other firms in the market. Thus product differentiation has led to the entry of new firms in the market and the industry has probably become a monopolistically competitive industry. Also free entry and free exit are also indicative of the monopolistically competitive industry
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