Billionaire investor Bill Ackman became something of a household name a decade ago when he famously declared weight loss and nutrition supplement maker Herbalife (NYSE:HLF) a “pyramid scheme.” His Pershing Square Capital Management hedge fund took a massive $1 billion short position in the stock.He waged war on the company for five years before conceding his loss and closed out the short. Sometimes you have to accept economist John Maynard Keynes’s maxim that regardless of your conviction, “the stock market ...