All aspiring billionaires should study the business case of Sara Blakely and her product, Spanx. She's one of the best examples of using necessity
Blackstone buys majority stake in shapewear maker Spanx, valuing
From Beyoncé To Sara Blakely: Nine Pieces Of Advice From Today's Wealthiest Women
How Sara Blakely Created A Billion-Dollar Brand
Sara Blakely's Net Worth: Spanx Founder Regains Billionaire Status
From Beyoncé To Sara Blakely: Nine Pieces Of Advice From Today's Wealthiest Women
Spanx founder gifts employees with plane tickets and cash
Sara Blakely - Wikipedia
How Sara Blakely Turned $5000 Into A Billion Dollar Spanx Fortune
Blackstone Buying Majority Stake in Spanx - WSJ