5. Boston, Massachusetts (USA)
Projected 2016 GDP per capita, PPP: $76,968
Up next in our list of richest cities in the world by 2016 GDP per capita is Boston and more than 4.6 million of its metro inhabitants who can be proud of their GDP PPP per capita income of $76,968. 0.5% GDP growth might not seem like much, but two years ago, people of Bean Town had almost $1,000 less at their disposal earning GDP PPP per capita of $76,204.