In Australian supermarkets the cost per unit weight net (typically 100 grams) has to be printed on shelf under &#x2F; next to the price.<p>I&#x27;ve proposed the idea that the price of everything in the supermarket be averaged per unit weight, checking out then becomes just a matter of weighing the trolley &#x2F; basket.<p>I see complications &#x2F; gaming the system, fun idea though.<p>Maybe just knowing how much you spend per average kg of food, or per unit of energy, could be a useful metric for optimizing food expenses.