As per Google search these are the top 3 richest person of this world.
1.Jeff Bezos $108.9 billion
2.Bill Gates $91.9 billion
3.Warren Buffett $90.1 billion
But these maybe wrong since in this world there are lot of blackmoney is available which were not recorded by any governments.
In my opinion the politicians from the third world countries can be in the richest persons because they were stealing all their country's taxes.
I also assume that third world countries may have a lot of money. But in General I think who has the most resources, and the richest man on earth. I can't tell you about people. I will talk about resource-rich countries