Huh, we've fixed that in Argentina, because supermarkets have to label the price both by unit, and by a standard measure (eg: kg / litres). So the price tag on

Huh, we've fixed that in Argentina, because supermarkets have to label the price both by unit, and by a standard measure (eg: kg / litres). So the price tag on toilet papers will display the price per metre, and the price tag on coffee has the price by kg. This makes it trivial to compare same-quality products, and also trivial to compare across different stores. Note that they MUST do this by law, so all supermarkets (and also wholesalers) do this.