I never really realized it before, but since I started working at one, I'm developing an arcane knowledge of the occultism practiced by grocers. I call it occultism for a reason. Occult means to shut off from view or exposure. It also means not easily understood, or abstruse. Junk food is taxed.
Books have a book tax.
If honey or maple syrup is produced locally, it is considered produce. Veggie dogs and tofu burgers are considered produce. All drinks under 600 ml are taxed. All beverages in recyclable containers have an additional bottle deposit charge. This looks pretty straight-forward, but appearances are deceiving.