In which set of market models are there the most significant barriers to entry?

Name: In which set of market models are there the most significant barriers to entry?
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Question

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Oligopoly and pure monopoly markets have the most significant barriers to entry. In oligopolies, a few firms dominate the market, making it difficult for new entrants to compete. In a pure monopoly, a single firm controls the entire market, creating the highest barrier to entry as new firms cannot enter the market easily.

In Which Set of Market Models Are There the Most