Comment by gdulli
7 hours ago
That's a very good point. People don't pull out their calculator in the grocery store to do analysis of unit costs or whatever, it's too much of a hassle for that small kind of analysis. But calculators have robbed us of the need to be good at doing that math in our heads. So the math doesn't get done.
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.
And it's so often wrong that you better be doing sanity checks if you use it for anything.
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.)
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That's mandated by law, not because the grocery story wants to.