[mason55]

Then this solution sounds like a huge improvement. Instead of getting to the register and finding out you grabbed the wrong thing or overspent, which is a huge inconvenience to you and the other people in line, you can now track everything as you go.

Put a can of soup in your basket. Oops! The alert I set up for items that aren't covered by Food Stamps just fired. Let me see what the issue is. Oh! I just got an alert because I went over my budget, let me review my items and figure it right away.

And even if you don't have a smartphone/app, the process of going to a kiosk to review your order will be much faster than at a register. Walk up to the kiosk and it instantly shows what's in your basket, with a total and flags for non-Food Stamp items. Now you can go swap things out or put things back and the whole interaction only took a second and was must less of a commitment than going through a checkout lane.

[sykick]

What you say seems plausible and I agree with it. I was responding only to the belief that not having enough money at checkout is 0.0001% of the cases.