Angola is the most expensive country in the world while Luanda is the most expensive city in the world for an expatriate professional migrant to live in. Singapore is the most expensive city in the Asia-Pacific region for expatriates (2nd most expensive in the world), while Hong Kong is the 2nd most expensive city in Asia-Pacific and is 3rd most expensive city in the world as at July 2018.
https://www.xpatulator.com/cost-of-living-article/International-Cost-of-Living-July-2018_729.cfm