Barriers to entry include government barriers, economies of scale, control over a key resource or input.
Barriers to entry are referred to as the obstacles which makes it highly difficult for a firm to enter a given market. Because of the characteristics of the market, they may arise naturally or they may be artificially imposed by firms already operating in the market or by the government.
Common barriers to entry can include strong brand identity, special tax benefits to existing firms, patent protections, high customer switching costs, and customer loyalty.
Thus, other barriers may include the need for new companies to obtain licenses before operation.
Hence, option D is correct.
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