I'll reiterate: the resolution is an answer to a question of whether it is true that "if a coffeeshop wants to pay their employees more they will have to raise

I'll reiterate: the resolution is an answer to a question of whether it is true that "if a coffeeshop wants to pay their employees more they will have to raise prices". If you have a defense (or a response where the phrase "in practice" appears anywhere, really), then that's a separate matter, but it does not follow strictly from the matters presented that the coffee shop "will have to raise prices" in order to pay their employees more. That's, in fact, a stronger claim than the factorable defense that the author (and others who make the same argument) is depending on. In other words, both "have to" and "can't" are doing a lot of heavy lifting.