There is lots of oil money in Angola so oil companies are sending Western expats to Luanda to get a piece of the pie. As a result, there is a demand for Western items in Luanda, but there is also a high security cost for importing goods. In essence, quick "forced" Westernization of an otherwise populous but African city is resulting in expensive living conditions.
and Trump is an idiot who doesn't understand the implications or ramifications of anything he does or says. Jerusalem is the capital of Israel, sure. But there are reasons why the US keeps its embassy in Tel Aviv. Trump is too stupid to grasp those reasons, though.
Also surprised not to see Monaco on the list.
Some might be surprised but Saudi Arabia is one of the lowest cost-of-living countries in the world. In addition to the high salaries, zero tax, and illegality of dating, this is part of why it's among the best places in the world to work and save money. Kuwait, Qatar, and the UAE (particularly Dubai) are all much more expensive comparatively.