Being 100% honest, have you ever not scanned an item on purpose when doing the self-scan at a supermarket? Or if it’s a fruit/veg/pastry that needs to be weighed, selected a cheaper item instead?
Conversation with a colleague the other day who reckons everyone has done this at some point. And that supermarkets are aware of this so have increased their prices since self-scans became more prominent, in order to account for a percentage of goods that’s inevitably stolen. I’m not so sure, I think that obviously some people do steal but probably not most?