Jeff Bezos being the world's richest man will likely be short lived over Bill Gates. One reason why is that Amazon's stock likely has so much further to fall when compared to Microsoft's stock. For instance, Amazon's stock is almost 100% away from its 200-week moving average. Meanwhile, Microsoft is almost 40% above its 200-week moving average. Both stocks will likely have massive sell-offs. But Amazon's will likely be much greater, putting him back under Gates.