Indeed, it's something the EU prevented. There are regulations on what the standard serving size is, and other regulations specifying how the item must be pric

Indeed, it's something the EU prevented. There are regulations on what the standard serving size is, and other regulations specifying how the item must be priced -- so all the milk says "per litre" under the price tag in the supermarket, even the fancy one in a tiny bottle. There were also preferred size regulations, which was meant to make it even easier. Breand could only be sold in multiples of 400g. I think this was relaxed, but it's still present for some things. A standard bottle of wine is always 75cL, for example.