A lot of this is probably price negotiation by those countries but how much of it is just charging based on people's income in each country? Things generally have to be "cheaper" in places that aren't the US Empire.
It's more overcharge in the US than the opposite. Also I don't really understand your question I guess, because the US does not have a higher income than other countries, except for a few jobs
My understanding was that the US generally does have higher incomes, at least in terms of US dollar equivalents. At least, if an American goes on vacation in another country, you can expect your money to go a lot farther.
time to renew your subscription plan dear 
A lot of this is probably price negotiation by those countries but how much of it is just charging based on people's income in each country? Things generally have to be "cheaper" in places that aren't the US Empire.
It's more overcharge in the US than the opposite. Also I don't really understand your question I guess, because the US does not have a higher income than other countries, except for a few jobs
My understanding was that the US generally does have higher incomes, at least in terms of US dollar equivalents. At least, if an American goes on vacation in another country, you can expect your money to go a lot farther.