In The Netherlands they bypass this by having one of the item brands in 'price per subitem' and one in 'price per kg'. So say you buy some chocolate. Both are

In The Netherlands they bypass this by having one of the item brands in 'price per subitem' and one in 'price per kg'. So say you buy some chocolate. Both are in a 12 piece carton. Brand A will note €0,10 per piece whereas brand B will note €0,15 per 100g.