Re: salaries that vary considerably depending on which country you work in;
It's because the cost of living isn't the same everywhere.
Yes, but up to now the place where you lived was tied with where you worked. Working at a certain office forced you to live nearby. When everybody is working from home anyway, it means you're telling your company "I like to live in New York, and so you should pay me more than this guy who prefers to live in Austin".