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The prevailing theory is that McDonald’s brings the McRib back whenever pork futures are down, because it maximizes profit. That is usually seasonal- in the early autumn, when grilling season is over.
In fact from what I’ve picked up over the years it’s kind of a meme in finance to declare “The price of X follows the return of the McRib!” when really both X and the McRib are just driven by the same larger economic factors and not by each other.



