Frictional unemployment occurs in a world of imperfect information because it takes a long time to find jobs.
Frictional unemployment is the period of time a person is unemployed from the period he leaves his current job and the time he gets another job.
For example, a person leaves his job in one city and moves to another city to search for a better paying job. The period of time between leaving the job and find another job, the person is frictionally unemployed.
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