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The qualitative difference between slavery and a job is that a slave is not allowed to choose a better option if one is available. A slave is barred from taking higher paid work, work with better conditions, etc. Even if it would be beneficial for their master (e.g. they do higher value work and all of the money goes to their master) they do not have the freedom to choose. A slave does not have the freedom to improve their circumstances even if it is a win-win situation. That is the qualitative difference between slavery and a job.