According to MSN Money Magazine, via Carol Tice, of Forbes Magazine, Chick-fil-A tops the list. The interesting thing about this company is that they operate only (6) days a week...never on Sunday. They average about $3.1 million dollars per year per store in top line sales, easily defeating McDonalds who holds the number two position at $2.6 million per store. Number three is one most of us would not be familiar with at $2.55 million per store...a company known as Jason's Deli out of Texas.
Now one could argue that the top line is not as important as the bottom line. So you should keep in mind that efficiency of operations and management will pay a key role in bottom line performance.
But having a "healthy top line" is always a nice thing to have. When seeking a franchise look at their history of success. The Franchise Circular Offering Document names each of the franchise owners and you are allowed to get in touch with them and ask questions.