问题
单项选择题
Which of the following situations is least likely to lead to high barriers to entry and monopoly supply（）
A. Natural resources are spread among many firms.
B. Governmental licensing and regulations are present.
C. Economies of scale are present.
答案
参考答案：A
解析：
All cases except wide distribution of a natural resource facilitate a monopoly. If natural resource ownership is concentrated in one firm a monopoly would result.