Answer:
D
Step-by-step explanation:
large number of existing firms is not a barrier to entry into a monopoly market as there is only one seller. A monopoly market is characterized by a single seller, lack of substitutes, large economies of scale, high barriers to entry, and profit maximization.
The unique product supplied by the monopolist can sometimes be protected by a patent or a government license allowing only the seller to produce it, thus, restricting competition. This form of monopoly is called a franchised monopoly.
a patent One way through which monopolies are created is through patents