单选题 Frictional unemployment results from: A. inflexible wages in the marketplace. B. recessionary business conditions and inadequate aggregate demand for labor. C. constant changes in the economy that prevent qualified unemployed workers from being immediately matched up with existing job openings.

【正确答案】 C

【答案解析】Frictional unemployment counts only the number of qualified and employable workers who are in transition between jobs. This unemployment stems from the constant changes in the demand and supply of specific employers and employees, and the time required for job seekers to conduct job searches.