[walthamstow]

We have the same in the UK. On rare occasions there is a bad comparison between two products, one will be per kg and the other per item, but otherwise it's a great system.

The problem in the US is that food/ag corporations are powerful and always fight against this kind of consumer information. Same with ingredient and nutrition labelling. They want the consumer to have as little information as possible (information asymmetry is the term in economics).

[nulbyte]

It may not be a law here in the US, but most stores do it anyway. Meijer, Kroger, Walmart all have per-unit prices in a corner of the tag. Most of the time, sale prices have them too.