I was looking around and saw a lot of shops in diagon alley. It occurred to me that students that are in higher years, 4th, 5th etc, would already have a lot of items that all 1st years would need to buy. For example, Duncan bought his wand for 1st year and assumably a cauldron some googles, random safety equipment and so on. Every student would need to buy new books,. but what else would higher years need to buy instead of just list as already owned inventory ?
Any ideas ?