Most expensive city in the world

This article explains why Singapore is the most expensive city in the world.
http://www.businessinsider.com.au/least-affordable-cities-in-the-world-2015-7#/#10-singapore-1

Here is the ranking of the top 10.

Singapore
World Cost of Living Index: 130

Paris, France.
World Cost of Living Index: 129

Oslo, Norway.
World Cost of Living Index: 128

Zurich, Switzerland.
World Cost of Living Index: 125

Sydney, Australia.
World Cost of Living Index: 120

Caracas, Venezuela.
World Cost of Living Index: 118 (tie)

Geneva, Switzerland.
World Cost of Living Index: 118 (tie)

Melbourne, Australia
World Cost of Living Index: 118 (tie)

Tokyo, Japan.
World Cost of Living Index: 118 (tie)

Copenhagen, Denmark.
World Cost of Living Index: 117