The top ten most expensive countries in the world as at July 2017 comprise two from Africa (Angola) (1); Ghana (10), three from Europe (Norway (2); Switzerland (3)); Denmark (9)), four from America (Bermuda (4); Cayman Islands (5); Barbados (6); Bahamas (7), and one from Asia Pacific (Japan) (8).

Angola is the most expensive country in the world for expatriate professional migrants mainly because almost all international standard goods and services have to be imported, as a result there are price premiums due to demand constantly exceeding supply.
https://www.xpatulator.com/cost-of-living-article/The-Most-Expensive-Countries-in-the-World-for-Expatriate-Professional-Migrants_717.cfm