单选题 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.

【正确答案】 A

【答案解析】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.