>As a downside, it does lead to "crafty consumers" using the unit price as their highest priority criteria for selecting products Literally nobody shops by try

>As a downside, it does lead to "crafty consumers" using the unit price as their highest priority criteria for selecting products Literally nobody shops by trying to buy the cheapest calories per unit. Calories are simply too easy to come by for that to matter. What people do is they make a menu (not necessarily before they go to the store) for the next 1-N meals then they choose brands or products that will accomplish that in the cheapest manner possible. This means they see the numbers and buy house brand butter. Where you get into issues is stuff like eggs where it's kind of hard to tell if the increase in size by buying large outweighs the savings per dozen by buying medium or where substitute products are not sold in easily convertible units and you have to do much more math in your head.