If you haven’t driven by YUM!’s combination stores, they are a site to see. A family of picky eaters can stop by a location and grab a combination (depending on the pairings) of pizza, tacos, fried chicken, fish, or burgers. The combination of stores varies depending on the area, and some even have three-in-one:

This song (and accompanying picture) can serves a great introduction to the concepts of product differentiation and economies of scope. The YUM! brands have a large presence in major categories in the fast food market:

4. KFC —  20,404 locations
7. Pizza Hutt — 13,728
11. Taco Bell — 6,500

Thanks to Rob Szarka for the recommendation.