Bill Ackman and Warren Buffett see value in these top retail stocks.If you want to invest like a billionaire, you have to be willing to buy shares when a company is experiencing temporary problems. It's only when the near-term outlook is gloomy that you can invest in a great business below what it's worth.Pershing Square's Bill Ackman and Berkshire Hathaway CEO Warren Buffett have executed a value-based strategy to amass multi-billion-dollar fortunes. While Wall Street chases hot tech stocks, Ackman and Buf ...