bill gatesChip Somodevilla / GettyMicrosoft founder Bill Gates is worth an estimated $85.7 billion.
There are two types of billionaires: those who inherited their wealth, and those who built it from nothing.
Our friends at Wealth-X, a firm that does research and net worth valuations on ultra-high net worth individuals, focused on the latter to compile a list of the wealthiest self-made billionaires in the world.
From tech mogul Bill Gates to Alibaba founder Jack Ma, here's who made the list. 

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