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I've wondered about this. I worked more than a few retail jobs when I was school, and though you don't see the order-of-magnitude output diff you could see amongst e.g. engineers, certainly some employees were 1.5-2x others. AFAICT, pay was basically flat, or based on time served
One of my jobs offered a $0.25/hour pay raise for passing an online exam that supposedly required ~6 study hours. No failure penalty. 5 exams total brought pay from $7.25/hour to $8.50/hour. I took them all my first week on the job. My single mom coworkers couldn't find the time.
