I live in a pleasant apartment complex and work as an Instructor. My job is cushy, which is good because I have health issues (and teach adults with health issues). But I watch workers mow the lawn at the apartment complex, re-shingle the roofs, etc. Other examples are food service workers and auto repair people with oil and sweat on them. I have worked on an assembly line for a while and the biggest problem for me was the intolerable loneliness. (It didn't do much for my feet, hands and back either.) I have cooked, cleaned, repaired cars and appliances and so on, but all in some moderation. I wonder about jobs where people do the same drudge work day after day?
I know about the idea of Karma, but it has gone flat for me, because the idea of Reincarnation has also. Leaving those aside (except for people getting good or bad consequences of their recent choices) what does Buddhism say about whether various work situations are more or less Just / Fair to the workers? This is not about Right Livelihood, because I am addressing the circumstances that workers are put in - the external world - rather than them choosing their work - the personal realm. [Consider only legally allowed work: I am not trying to deal with crime here. Also, don't try to solve the problem, only explain the perspective on it, please.]