The World's Most Expensive Cities 2010
finance.yahoo.com
finance.yahoo.com
If you live like a Western executive, though, it can be kind of pricy. (My friends and I sometimes talk -- mostly jokingly -- about the English tax: if you need somebody to explain things to you in English, you are almost certainly paying a premium over market for that service. On high-end apartments, for example, the difference between going to the place I know which markets itself as foreigner friendly and walking into the apartment service and asking for the comparable apartment next door is about 50%.)
With this system, the only really necessary expenses not covered are the culturally mandatory, after work drinking sessions.
That's the only explanation for all the African cities. No doubt American food, and in particular, American brands, are very expensive there.
OTOH, if you're willing to eat native foods and buy native brands, I seriously doubt Louanda is all that expensive.
I can't even hover over the images/thumnails and get the name of the city! Even the URIs are numbers and not names, so I actually have to click through 50 pages!
EDIT:
Here y'all are: http://www.numbeo.com/cost-of-living/rankings.jsp
If they would have factored in the costs for buying an apartment or a house, it would look a lot more sane, and you would get numbers that are closer to what you would expect.
http://images.businessweek.com/ss/10/06/0622_most_expensive_...
"Note: Prices are for Manhattan only."