Why Do Fast Food Restaurants Still Use Disposable Coffee Cups?

Disposable coffee cups, for the most part, are purchased by only a few types of businesses: restaurants and, in some cases, offices. When it comes to a fast food restaurant, there's not much of a choice. Since they can't expect customers to return coffee cups, they have to give them the product in a container that is expected to be tossed. Unless someone develops a really innovative solution, fast food restaurants will have to continue to operate this way, creating a constant demand for the disposable coffee cup.