Willy Staley's "A Conspiracy of Hogs: The McRib as Arbitrage," is a lyrical, insightful conspiracy theory about the appearance and disappearance of McDonalds's McRib sandwich. Staley argues that the McRib's appearance correlates with falls in the pork futures market, and represents a way for McD's to cash in on cheap pork, representing a kind of triumph of restaurant automation, logistical acumen, and financial engineering. In Staley's view, McDonald's is only secondarily a restaurant, and primarily conducts the business of a commodities brokerage.
I've long been fascinated with injection-molded protein slurry masquerading as some recognizable foodstuff. I once proposed a line of perverse vegan aerosol meat substitutes like "I can't believe it's not organ meat" and "I can't believe it's not marrow bones" that would come as a soy spray in a mousse can whose nozzle mated with a dishwasher/microwave-safe mold (with plastic "bones" as appropriate) that you could nuke for a minute before ejecting the piping hot reformed slurry on a plate and popping the mold right into the dishwasher.
Fast food involves both hideously violent economies of scale and sad, sad end users who volunteer to be taken advantage of. What makes the McRib different from this everyday horror is that a) McDonald's is huge to the point that it's more useful to think of it as a company trading in commodities than it is to think of it as a chain of restaurants b) it is made of pork, which makes it a unique product in the QSR world and c) it is only available sometimes, but refuses to go away entirely.
If you can demonstrate that McDonald's only introduces the sandwich when pork prices are lower than usual, then you're but a couple logical steps from concluding that McDonald's is essentially exploiting a market imbalance between what normal food producers are willing to pay for hog meat at certain times of the year, and what Americans are willing to pay for it once it is processed, molded into illogically anatomical shapes, and slathered in HFCS-rich BBQ sauce.
The McRib was, at least in part, born out of the brute force that McDonald's is capable of exerting on commodities markets. According to this history of the sandwich, Chef Arend created the McRib because McDonald's simply could not find enough chickens to turn into the McNuggets for which their franchises were clamoring. Chef Arend invented something so popular that his employer could not even find the raw materials to produce it, because it was so popular. "There wasn't a system to supply enough chicken," he told Maxim. Well, Chef Arend had recently been to the Carolinas, and was so inspired by the pulled pork barbecue in the Low Country that he decided to create a pork sandwich for McDonald's to placate the frustrated franchisees.