A true world economy is hundreds of years away if it ever happens at all.
I am an American living in Tokyo and if I want a Hershey's chocolate bar I have to take a 45 minute 1,300 Yen train ride to the nearest "import goods" shop and pay 500 Yen for the chocolate. That is if they have it in stock this month.
I can't get good bratwurst in America or Japan either.
Nobody writes letters about it.
What is so "unfair" about not being able to acquire stuff made in other countries? It has been like this since the beginning of humankind.