Top 10 Most Expensive Cities in the World

For all of you that are considering to relocate in another city or another country, this information is extremely valuable.
Mercer released recently their "Cost of Living City Rankings" and according to Mercer research, the Top 10 most expensive cities to live in are:

1st - Luanda, Angola
2nd - Moscow, Russia
3rd -  Tokyo, Japan
4th - N'Djamena, Chad
5th - Singapore, Singapore
6th - Hong Kong, Hong Kong
7th - Geneva, Switzerland
8th - Zurich, Switzerland
9th - Bern, Switzerland
Also in 9th - Sydney, Austrália