Final answer:
Oligopoly is the market structure with the highest barriers to entry due to limited firms, contrasting perfect competition where entry is more open.
Explanation:
Oligopoly is the market structure in which entry into the industry is the most prohibitive due to barriers to entry and only a few firms existing. Unlike perfect competition where there are many firms producing homogeneous products and no barriers to entry, oligopoly presents significant challenges for new entrants, making it the most prohibitive market structure.
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