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.

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oasisaimlessly 5 hours ago | parent | next [-]

And it's so often wrong that you better be doing sanity checks if you use it for anything.

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Terr_ 5 hours ago | parent [-]

Is it often flat-out wrong where you live?

My 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.)

	▲	gdulli 5 hours ago \| parent [-]
		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.

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shimman 6 hours ago | parent | prev [-]

That's mandated by law, not because the grocery story wants to.