Grocery is a huge business. I learned that early on. My first job as a bagger at the local grocery store eventually led to my first full-time job helping manage a store for a major supermarket chain. I saw firsthand in the late 1980s and early 1990s how Walmart sent shockwaves through the industry when it started selling groceries in its supercenters. In no small part, Walmart contributed to the struggles at the supermarket chain I worked for, eventually causing it to disappear forever. Walmart went on ...