[esrauch]

For almost any nonessential item, no one knows what they want until they see it. That might be seeing it when you are walking around a store, seeing your friend who had it, or seeing an ad for it on google but no one would ever think "I need an XBox360" if they have literally never heard of it.

There are rare exceptions, eg someone is hiking and their toes are too cold and they think "I wish I had boots that would keep my toes warmer", then they go find an item that matches that, but I think that is a tiny percentage of the purchases.