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.
Yes, these are official data, and they may not reflect an objective picture. The President dictator of any poorest African countries may be as rich as the people on the list, you're right about that. There is a lot of shadow money in the world, it may be that the richest person is the head of the poorest country, because he appropriated all the money of this country.