Link: Business Insider
Date: 2021-09-12

Why

Transparency in fairness.

How

Laws and people's support and lobbyist not stopping them.

Opinion

It is a scary concept because everyone will know how much they are valued and if they are being paid as required. Will also quickly reveal and echelon of classes and help people who do not know their value, to finally realised how much they should be getting paid.
Also gives a good look into pay equality. People who are good at negotiating better salaries and not because of skill, will lose out in this.