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$8 for a cup of coffee in Moscow. $200 for a pair of jeans in Luanda. These cities charge top dollar for the most basic purchases, according to Mercer's survey of 214 cities.
Just getting to N'Djamena is expensive. A round-trip flight from New York's JFK airport to this central African city costs at least $2,500, on Travelocity.
Once you get there, things don't get much cheaper. Order a club sandwich and a soda in Chad's capital city and it will easily cost you $25 or more, according to Mercer's report. Grab the daily paper and it will cost close to $7.