李同学2019-03-27 09:05:30

01.单选题 已收藏 标记 纠错 In perfectly competitive industries, what is the most likely long-run effect of a permanent decrease in demand? A Price decreases. B Firm incur economic losses. C The number of firms decreases. 查看解析 下一题 正确答案C 您的答案A本题平均正确率：58% Perfect competition难度：一般 推荐：      答案解析 A permanent decrease in demand in a perfectly competitive industry will in the short-run cause the demand curve to shift to the left, causing prices to fall. However, in the long-run, firms will leave the industry due to economic losses. As firms leave the industry, supply decreases (i.e., the supply curve shifts left-ward) thus increasing prices back to the equilibrium where economic profit is zero. 问：这题怎么确定是短期 和 长期的结点，能不能用图示意之？