Why Does the Grocery Store Keep Moving Everything?

You knew exactly where it was. Then one day, it wasn't.

No, your grocery store probably isn't moving things around just to mess with you. There's a system behind what goes where on the shelf.

A grocery shelf has limited space and a constantly changing assortment competing for it. New products arrive. Others are discontinued. Seasonal items change. Some products earn more space. Others lose it.

Behind much of that movement is a planogram — the blueprint that tells the store what goes where and how much space each product gets.