In most of Europe, at least in the part of it where I've lived, you have both types of stores. If the store has a separate back, you only 1-2 sizes of each mode

In most of Europe, at least in the part of it where I've lived, you have both types of stores. If the store has a separate back, you only 1-2 sizes of each model on display. If the store doesn't or it's too small, you have 1-2 sizes on display next to a more or less organized pile of shoe boxes. I think the main reason for either is whether the store is built one way or another.