According to Business Insider, the richest man of all time was John D. Rockefeller. Adjusted for inflation, he had a net-worth of over $300 billion. If he traveled to some lifeless rock in the Pacific Ocean and declared sovereignty today, he would replace oil rich Venezuela as the 37th richest country in the world, with even some European countries and Middle Eastern oil emirates falling behind this one man. He grew his wealth by buying oil companies left and right until he eventually owned 90% of all the oil in America.
And yet the richest man in the history of the world could not buy a microwave oven. For $60 I can go on my Amazon app and have a microwave delivered to my door, something Rockefeller could not do with his $300 billion.