Just anecdotal, but I was once chatting on a plane with a guy working as a meat buyer for a major dog food brand. He told me his work was to negotiate the cheapest thing that would pass legally as meat as possible, in the biggest quantity as possible. He then mentioned in passing that his toughest competition was Mc Donald's.
I've heard very similar tales. A local lad who works at a very large meat processing factory, McDonalds buy the cheapest meat possible. Other chains buy middle of the range meat.
