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Chains also have more employees than all but the very largest independent shops, so they have the staff on hand to a two man car repair easily and to speed up repairs by adding more mechanics if the job can go faster with more hands. An assurance of quality is the second reason. Chains hire only licensed and certified mechanics. Plus, the more employees a shop has, the more likely it is to have a specialist for each part of the car, which means the shop is more likely to be able to diagnose unusual problems and to have someone who can do difficult and highly specialized repairs. The third reason is convenience.