In our lifetimes, we could see the first trillionaire.
That's according to research by Oxfam, an international network of organizations collectively working to alleviate global poverty. Its recently published report finds that eight billionaires from around the globe have as much money as the 3.6 billion people who make up the poorest half of the world's population.
The report also finds that, given the exponential growth of existing wealth, the world could have its first trillionaire in the next 25 years, when Gates would be 86.
When Gates left Microsoft in 2006, his net worth was $50 billion, according to Oxfam. By 2016, his wealth had increased to $75 billion, "despite his commendable attempts to give it away through his Foundation, " the report says.
In addition to the charitable work Gates does through his personal foundation, he is one of the founding members of The Giving Pledge, a commitment from some of the richest individuals in the world to give away more than half of their worth.
For the hypothetical analysis, Oxfam researchers apply the average rate of growth the ultra-rich have been enjoying, 11 percent per year since 2009, to Gates' current levels of wealth (over $84 billion, according to Forbes). If his investments keep doing as well as they have been, the 61-year-old Gates could indeed become the world's first trillionaire.
"In such an environment, if you are already rich, you have to try hard not to keep getting a lot richer," Oxfam notes.