Many grocery stores will already give you a per oz or per unit price so you can compare pricing for different brands that have different sizes. It's a very handy feature.
replyAnd it's so often wrong that you better be doing sanity checks if you use it for anything.
replyIs it often flat-out wrong where you live?
replyMy most-common frustration with it is when products I want to compare don't have the same quantity-denominator. (Either a different unit, or sometimes a different dimension like weight versus volume.)
I've many times seen it wrong but more often the same item will have some tags expressed on cost per ounce, others per lb, etc. To discourage comparison. But I dont think people are paying much attention to those numbers anyway. Math has become a scary topic for them altogether.
replyThat's mandated by law, not because the grocery story wants to.
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