Why This City Is Most Expensive In The World?

For the second time in three years, the African city of Luanda has been declared the most expensive city in the world for expats by Mercer, ahuman resources consulting firm.
While it's true that most of the Angolan capital's population lives in poverty on the outskirts of the city, in the center, Porsche Cayennes share the road with Cadillac Escalades and the latest Range Rovers.
Hugo Boss makes such a killing here that it opened a second store within walking distance of the first.

For those not familiar with Luanda, however, the ranking may come as a surprise.

Tokyo (which took top spot in Mercer's survey last year) makes sense as the world's most expensive expat city.

So might Moscow or New York.