Feels to me it would be in company's interest only if the salaries were more transparent. Otherwise company will pay as little as they can to keep the person wo

Feels to me it would be in company's interest only if the salaries were more transparent. Otherwise company will pay as little as they can to keep the person working for them, even if that's well below the value the employee delivers. If the employee doesn't realize that, they'll just stay. And as long as the company doesn't lose good employees, there's no incentive for them to pay people more.