How Bill Gates Makes And Spends His Billions

Bill Gates is currently the world's second richest person with a net worth of over $93 billion. In 1975, childhood friends Bill Gates and Paul Allen founded Microsoft and went on to create the operating system for IBM's first personal computer. Although Gates loves his luxury vehicles, he says his primary concerns are global warming and putting an end to polio. In this video, Business Insider explains how Bill Gates both makes and spends his billions.