Which market structure is characterized by the absence of barriers to entry?

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Barriers are absent in a monopolyBarriers cannot be found in an oligopolyBarriers do not exist in monopolistic competitionBarriers are present in perfect competition

Explanation

Barriers to entry are typically absent in monopolistic competition, allowing new firms to enter the market relatively easily. In contrast, monopolies and oligopolies usually have significant barriers, while perfect competition assumes free entry and exit, meaning no barriers.