An expatriate professional migrant is someone who voluntarily lives outside their country in order to take up a job opportunity and a better or at the very least a similar, quality of life with the intention returning to their home country and do not therefore consider themselves to be local in their host country.

The top ten most expensive countries in the world for expatriate professional migrants comprise three from Africa (Angola) (1); Democratic Republic of the Congo (5); Eritrea (7)), three from Europe (Norway (2); Switzerland (3); Denmark (8)), and four from America (Bermuda (4); Cayman Islands (6); Barbados (9); Bahamas (10)).
http://www.xpatulator.com/cost-of-living-article/The-Most-Expensive-Countries-in-the-World-for-Expatriate-Professional-Migrants-July-2016_689.cfm