Meh, money doesn't really work that way since you have to factor in education level vs general populace, supply vs demand for his job/service, living costs, and taxes.
Ignoring taxes,
In Greece I'd be making 20,000-30,000 euros/year.
In Sweden, I'd be making the equivalent of ~75k USD (I make more right now in NYC) a year, which is only 1.4 times their average salary, if I'm being really generous with the numbers.
It varies from job to job, but usually moving to a richer country won't make you rich unless you work for a really long time and bring the money back to the country with a poorer economy.