Why would you pay two people doing the same job vastly different salaries because one lives in A and the other lives in B? That's the better question to be answ

Why would you pay two people doing the same job vastly different salaries because one lives in A and the other lives in B? That's the better question to be answered. I am not bottle of coke, and neither are my colleagues, we're humans, so your analogy makes zero sense.