Although I think the topic of fast food provides students with a terrific entry point into talking about industrial food production, I'm disappointed that we won't have time this semester to cover the industrial food chain that leads backward from the modern supermarket. At some point in the future, I may re-tool the course to include that material. The best article I've found so far is Raj Patel's "Checking Out Supermarkets" from his amazing book Stuffed and Starved. I think this article would work extremely well with a unit on supermarket design.
Here is Stuffed and Starved at Amazon.com. No preview, unfortunately.