Here are the definitions matched with the corresponding types of market structure:
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A market with significant barriers to entry and a small number of price-setting firms.
Oligopoly -
A market with no barriers to entry and a large number of price-taking firms.
Perfect competition -
A market with significant barriers to entry and a single price-setting firm.
Monopoly -
A market with no barriers to entry and a large number of price-setting firms.
Monopolistic competition