问题
单项选择题
In the long-run, a firm operating under perfect competition will:（）
A. generate zero economic profit.
B. face a vertical demand curve.
C. become a price-searcher.
答案
参考答案：A
解析：
A firm operating under conditions of perfect competition will generate zero economic profit in the long run. Firms may generate economic profits in the short run, but due to the lack of entry barriers, new competitors will enter the market and prices will adjust downward until economic profits become zero.