On the other hand, confusing pricing can be used to get people to spend more. My local supermarket sells lots of produce as £X/kg and £Y/item. People buy a bag

On the other hand, confusing pricing can be used to get people to spend more. My local supermarket sells lots of produce as £X/kg and £Y/item. People buy a bag with three onions in for 65p instead of picking up three onions from the box right next to it at 75p/kg.