Entry barriers are most significant in

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Entry barriers are most significant in pure monopoly because there is only one dominant supplier in the market with no close substitutes, making it very difficult for new firms to enter the market and compete with the monopolist's established position. In other market structures such as pure competition, there are many small suppliers with free entry and exit, making it easy for new firms to enter and compete. In monopolistic competition and oligopoly, there are some entry barriers, but they are not as significant as those found in pure monopoly.

Entry Barriers Are Most Significant in