What if the other person costs less because they're being paid under the table? Unfortunately, that's been the case in a lot of lower income and manual labor jobs.

Construction and landscaping are notable examples. If the buyer only cares about cost, and the government adds 20-50% to the cost of wages, then the employer who bypasses the government thrives.

The double standard that enables many of our labor challenges is that people want a higher minimum wage, tend to oppose enforcement, and buy the cheapest option regardless of legality.

Laws that are helpful when fully enforced are destructive when partially enforced.

By the same token, if that next computer you buy is cheaper because it was built in a country with cheaper to implement labor laws than the ones you voted for in your country, how is that ethical?