I usually end up talking about supply chains and counterfeiting and such with staff when I go to shops with people, or their inventory management systems, turn

I usually end up talking about supply chains and counterfeiting and such with staff when I go to shops with people, or their inventory management systems, turn rates, numbers of SKUs, etc., assuming I don't care about the product. The other fun game is "why is arbitrary product A worth more than arbitrary product B". This only really works in higher end stores; wouldn't work in a Walmart, but there I'm busy scouring the ammo shelves for deals.