I am not certain what the law is, but stores here in the U.S. routinely list the per-unit price on the shelf tag. Costco certainly does, Kroger does, but I don

I am not certain what the law is, but stores here in the U.S. routinely list the per-unit price on the shelf tag. Costco certainly does, Kroger does, but I don't know if all stores must. I wouldn't be surprised. I don't often look at per-unit when going between stores, I more often use it to gauge the value of upsizing at the same store, or comparing to other brands of the same product that are on the shelf nearby.