问题
单项选择题
Regulations are frequently implemented that attempt to deal with markets with high barriers to entry. Which statement is least likely to be a reason why they often fail（）
A. Regulators prevent monopolists from making a profit.
B. Regulators fail to fully understand the firms cost curves and demand schedule.
C. An existing firm in the industry is able to influence the regulatory board.
答案
参考答案：A
解析：
Regulators do not seek to prevent monopolists from making a profit. Instead using average cost pricing, regulators will try to prevent monopolists from making a zero economic profit and ensure the monopolist a normal profit. The other choices are reasons why regulations can fail.