Over the past five years, Whole Foods Market’s (NYSE: WFM) stock is up more than 150%. Yet last month, founder and co-CEO John Mackey told Motley Fool CEO Tom Gardner that the Great Recession was a “nightmare” for him.

In the video below, Mackey shares his thoughts on his one big lesson from the downturn: preparing for another rainy day. (A transcript is provided below; running time: 2:52.)