When I'm using the app-based version of this kind of system, I find myself much more likely to put an item back on the shelf when I see the price come up in the

When I'm using the app-based version of this kind of system, I find myself much more likely to put an item back on the shelf when I see the price come up in the app (or when I notice how high my total bill is getting). Being surprised at the total spend after visiting a supermarket used to be quite common for me, and I'm sure I'm not alone in that experience! Of course Amazon are well aware of this psychology and only send you the bill after you leave the store...