Shopping is several things, here are three: replacing day-to-day consumables, satisfying an identified, usually one-off, need, and exposing oneself to virtual and/or real-life temptation.
That latter has a bad reputation, the province of those with too much money and time. Unfair! When I read book reviews or The Gramophone I rarely need a book or CD, I'm asking to be tempted. Samphire may be a distant concept when I walk through a French street market but then I see it and buy it.
But how about this? In my ski-ing days I often wandered into ski shops with a blank mind. I already owned skis, boots, anorak and salopettes; replacing any cost real money. Was I comforted by "being with" these products? Was I pretending to look for improvements in a leisure industry notorious for selling fashion rather than benefits? I have no idea but I worry even now.
No one enters Tesco with a blank mind, only imperatives: sliced bread (Shock! Horror!), drain cleaner. But recently I saw a world within a world. A mother with a bunch of bananas in her trolley broke one off, peeled it and gave it to her child. An empty skin at check-out. An imperative had become a temptation and had been satisfied all within a minute: I liked the circularity, far from marketing ploys and advertising strategy.
A fantasy arose. I re-entered the ski-shop, bought skis, boots, etc, donned them, and ski-ed down a car-park now sloping and magically covered with snow. Then I knew...