单选题
Which of the following most accurately describes a market structure
that has one seller of a specific, well-defined product that has no good
substitutes?
A. Oligopoly.
B. Monopoly.
C. Monopolistic competition.
【正确答案】
B
【答案解析】A monopoly is characterized by one seller, a specific and well-defined product for which there is no good substitutes, and high barriers to entry.