There is no such thing as a "slave wage" as that is a direct violation of the Law of Non-Contradiction. If the pay you receive for a line of work for which you opted is insufficient in your completely arbitrary assessment (and by the way, a wage is a price, and prices aren't just random numbers, they actually mean things about real economic conditions), nobody (other than perhaps the government and/or yourself) is preventing you from finding a better paying job. But somebody not giving you something you think you deserve is not a form of oppression, or exploitation, or anything of the sort, certainly not slavery.