Markets don't care about justice. It's all about supply and demand. If a company needs people on-site in SF and also needs people on-site in Atlanta, it will

Markets don't care about justice. It's all about supply and demand. If a company needs people on-site in SF and also needs people on-site in Atlanta, it will have to pay the former more than the latter. If they don't, they will either be paying more (if they give the Atlanta folks extra money) than they have to or they won't be able to fill the positions (if they don't give the SF folks extra money).