Just because it's minor doesn't mean it's nonexistent. I think it's fair to say that cash subsidizes cards, and the other cards subsidize AmEx. Stores should be

Just because it's minor doesn't mean it's nonexistent. I think it's fair to say that cash subsidizes cards, and the other cards subsidize AmEx. Stores should be free to pass on the transaction fee, it's not fair that processors can hide it.