The capital of oil-rich but poverty-stricken Angola is the world’s most expensive city for expatriates, according to a new cost of living survey that also showed other developing African and Asian cities were among the priciest in the world. Luanda knocked the Japanese capital Tokyo off the top of this year’s Mercer Worldwide Cost of Living Survey. Tokyo, regularly rated as one of the world’s most expensive cities, was in the second slot while Ndjamena, the capital of impoverished, violence-ridden Chad, came in third. (Reuters)