I don't think the economic drawback to slavery is about the labor conditions, I think it's the lack of ability to improve you position. Chattel slavery puts abo

I don't think the economic drawback to slavery is about the labor conditions, I think it's the lack of ability to improve you position. Chattel slavery puts about as wide a gap between two human's interests as anything I can think of, with war being a possible exception. The suggestions that slavery grew out of organized warfare explain a lot, I believe. So even if you had similar working conditions, I think you would have dramatically different social pressures and interests.