1. This country tiny country consist of 63 island and some mainland with a total area of only 270 square miles (704 sq km). With Hong Kong, South Korea and Taiwan it is considered one of the Four Asian Tigers. Singapore has the busiest port in the world and is the 4th largest foreign exchange trading center in the world. Singapore is widely believed to be the most business-friendly economy in the world. 6. Singapore – $48,900