> it also happens in the EU that one item will be shown as €/100g and another as €/kg In my experience this difference is decided by what a "normal" amount of

> it also happens in the EU that one item will be shown as €/100g and another as €/kg In my experience this difference is decided by what a "normal" amount of the good tends to be. For example, €/kg is usually used for meat, flour etc, but for something like spices or herbs a price of €/kg would seem silly since you rarely buy, and it's rarely sold in, a kilo. Still, a luxury of the metric system is that even if it's listed as €/100g, all you have to do is multiply by ten (aka move the decimal one step).