Discriminating wages on arbitrary criteria like geographic location goes against equal work = equal pay and that compensation should be based on contribution [1].

Location base: For the other 65% of the base, we factor in each location’s cost of living using Numbeo together with data from Payscale and Glassdoor, which we then use to have a base salary for that particular location (say New York or Cape Town).

[1] https://elsajohansson.wordpress.com/2017/09/13/what-does-a-w...