Jeff Bezos and Benjamin Graham

If Warren Buffett is the best investor of all time, Jeff Bezos has to be the best business manager (or salesperson of all time).

In a period half as long as Buffett has been investing, Bezos built the biggest retail giant on earth, creating a fortune for himself and his investors over the same period.

This is something even Buffett has acknowledged. In an interview with CNBC last year, Buffett called Bezos "the most remarkable business person of our age." He continued, "I've never seen a guy succeed in two businesses almost simultaneously that are really quite divergent in terms of customers and all the operations," citing the Amazon group's cloud computing and...