One reason economies always experience some unemployment is job search. Job search is the process of matching workers with appropriate jobs. If all workers and all jobs were the same, so that all workers were, equally well suited for all jobs, job search would not be a problem. Laid-off workers would quickly find new jobs that were well suited for them. But in fact, workers differ in their tastes and skills, jobs differ in their attributes, and information about job candidates and job vacancies is disseminated slowly among the many firms and households in the economy.