> ...but in my experience, they're perfectly capable of doing the right thing

It's both true. Given that a typical store can have thousands of SKUs displayed, mistakes will _always_ happen once in a while. A forgotten price tag, an incorrect sale price, etc.

But at the same time, stores are more than capable of having a system to _fix_ these issues as soon as they are detected. It doesn't even take much, just a way for a cashier to flag an inconsistent price for someone at the back office.

Exactly. A mistake here and there is fine. Dollar Store is clearly on another level.