A $9 Mojito or an $8 Margarita. Different prices for a beer served at a restaurant’s bar instead of the same beer served at the table. When those price differences are not disclosed on a restaurant’s menu, which often don’t list drink prices at all, can those nondisclosures be the basis for class-action suits?

The New Jersey Supreme Court will soon give an answer. The court on Tuesday heard arguments over whether restaurants violate state consumer-protection laws when they fail to list mixed drink or beer prices on their menus.