The theory that the McRib’s elusiveness is a direct result of
the vagaries of the cash price for hog meat in the States is
simple: in this thinking, the product is only introduced when pork
prices are low enough to ensure McDonald’s can turn a profit on
the product. The theory is especially convincing given the McRib’s
status as the only non-breakfast fast food pork item: why wouldn’t
there be a pork sandwich in every chain, if it were profitable?