In this unit, we have talked about how companies try to set up barriers to entry in their markets. Apparently, a Panera Bread bakery in a Massachusetts mall wrote into their contract that no other sandwich shop could open in that mall. They then used that clause to try and stop a Mexican burrito place from opening in the mall.
This leads into a court having to rule whether a burrito is a sandwich. The court ruled in favor of the burrito place saying that a burrito is not a sandwich.
(Source: Greg Mankiw's Blog)