Jeff Bezos knows a thing or two about spotting good business opportunities. At age 30, he left the security of a high-level job in finance to launch the online bookstore Amazon. Years later, his keen business sense has transformed the company into an e-commerce juggernaut with a $1 trillion market cap.

With years of experience under his belt, the CEO shared the four key characteristics of a "dreamy" business in a 2014 annual shareholder letter. "Customers love it, it can grow to very large size, it has strong returns on capital, and it's durable in time – with the potential to endure for decades," he wrote.