When it comes to laws there a general good approach to make them very general. General laws a morally useful since we then treat people equal and in fair ways using objective methods to measure success.

So to take such approach here, should a nation make a distinction between a brothel and a construction company? Both has a certain amount of work related injuries, exposure to hazards, and a long history of exploiting workers. A common law can regulate, monitor, and minimize those problems for all industries, and measure the success using establish methods. If workers are in a weak bargaining position then that is often the signal for nations to step in and demanding things like minimum safety rules, minimum wages, overseeing boards, and increased liability for companies.