问题
单项选择题
In the long-run, after all firms in a perfectly competitive industry have adopted new technology, the:（）
A. price will be set where average variable cost is equal to marginal revenue.
B. price will equal minimum average total cost.
C. individual firm supply will decrease as the cost of implementing technology increases.
答案
参考答案：B
解析：
After some firms in an industry adopt a technological change, the existing firms that use the old technology will experience losses and either adopt the technology or exit the industry. Long-run equilibrium with price equal to minimum average total cost for the new technology will be established.