In Sweden, "jämförelsepris" (comparison price) is mandatory for many goods. This means stores have to, in addition to price, display "price per gram" or whatever unit makes sense.
This way, you can quickly compare different groceries despite differing packages, and shrinking the item for the same price would be visible when looking at the comparison price.
This way, you can quickly compare different groceries despite differing packages, and shrinking the item for the same price would be visible when looking at the comparison price.