You have to wonder why, page-10

The crony capitalist index ranks nations based solely on the aggregate wealth of its billionaires as a percentage of the nation’s GDP, and only if their fortunes are derived from the industries listed below.  The methodology used is acknowledged as having serious limitations.



I’d suggest that the Corruption Perceptions Index might be a more accurate gauge. It ranks nations by their perceived levels of public sector corruption and is the most widely used indicator of corruption worldwide.

Ranked 6th best in the world in 2017, Singapore actually outperforms Australia (13) and the United States (16).