Inside Google's policy to 'pay unfairly' — why 2 people in the same role can earn dramatically different amounts

Here is the article. I like to learn "pay unfaily" principle.

10 times more than average people - how to understand the principle?

Bock admits that a policy to "pay unfairly" is provocative, and that it might be better characterized as "pay unequally." In his view, it is actually more fair to pay a top performer significantly more than an employee with the same job title who produces less value.