多项选择题
Which of the following are necessary characteristics of a monopoly? A.
The firm is the sole seller of its product. B.
The firm's product does not have close substitutes. C.
The firm generates a large economic profit. D.
The firm is located in a small geographic market.
Which of the following are necessary characteristics of a monopoly? A.
The firm is the sole seller of its product. B.
The firm's product does not have close substitutes. C.
The firm generates a large economic profit. D.
The firm is located in a small geographic market.