You need to consider the full picture. If somebody gets hired to do my job for half my salary, no job security and worse working conditions and they say they're

You need to consider the full picture. If somebody gets hired to do my job for half my salary, no job security and worse working conditions and they say they're happy to do so, I'd still want the courts to decide whether those are acceptable terms. Otherwise it's just a race to the bottom. See how many on HN seemed very happy that the USA made it harder for foreigners to get a work Visa in the USA because it undercut the local workforce. Unfettered capitalism will gladly let workers eat other for scraps.