> This applies to goods rather than labor to a much higher degree. Permanently owning the labour of 10 people working 16 hours per days is worth a lot more toda

> This applies to goods rather than labor to a much higher degree. Permanently owning the labour of 10 people working 16 hours per days is worth a lot more today than 10 slaves back then. Yes, but that's also because of the productivity increase linked to the cheap energy and phosphate supply brought by fossil fuels. If cheap energy stop being available and human labour become again the main driver of economic output, you can bet that slavery will soon come back in fashion...