I think you're missing the point. The bakery would have to sell "less-than-fancy" sandwiches, but the sandwich shop could sell sandwiches with bread just as good as the bakery would use.
The bakery has to become a inferior sandwich shop to make sandwiches. The sandwich shop doesn't have to become a bakery to bake just the types of bread that they need to wrap their sandwiches.
The bakery would be better off selling dough to the sandwich shop.
The bakery has to become a inferior sandwich shop to make sandwiches. The sandwich shop doesn't have to become a bakery to bake just the types of bread that they need to wrap their sandwiches.
The bakery would be better off selling dough to the sandwich shop.