You've heard the (true) idea that McDonalds is not actually a fast food restaurant; it is really a commercial real estate company that by historical coincidence just happens to sell hamburgers.
https://storeys.com/mcdonalds-canada-commercial-real-estate/
But McDonalds is so huge that even the "just" in "just sells hamburgers" has a tectonic impact on adjacent markets, and one manifestation of that phenomenon is the McRib.
"A McRib" is a sandwich.
"The McRib" is a huge exercise in pork-market arbitrage.
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