Mark Cuban, who made billions from the dot-com bubble, says here's how you'll know the rally is over

Mark Cuban is an American business magnate, investor and philanthropist. He is the owner of the National Basketball Association's Dallas Mavericks, Landmark Theatres, and Magnolia Pictures, and the chairman of the HDTV cable network AXS TV. He is also a "shark" investor on the television series Shark Tank. In 2011 Cuban wrote a book, How to Win at the Sport of Business: If I Can Do It, You Can Do It, in which he chronicles his life experiences in business and sports.

Photo Credit: Gage Skidmore