I think the first question is: - Do you want to pay fair - do you want to maximize value for your money - or do you want to hire from the pool of the top 10%

I think the first question is: - Do you want to pay fair - do you want to maximize value for your money - or do you want to hire from the pool of the top 10% world wide? max value: you hire for little money from poorer nations top 10%: you adjust to local rates fair: here it gets philosophical... I'll probably go with you pay everyone the same, which probably again means you'll not hire from rich countries.