A supplier delivery arrives. Dozens of crates. You sign and move on.
There is no time to check every line. The invoice goes in a drawer. Somewhere in those crates, 12 products just increased in cost. Your till still sells them at the old price. You will not know for weeks.
This is how invisible margin leaks start. Not from theft. From prices that drift while nobody is looking.
- Frozen pizza, own brand−16% margin
- Jellies multipack−8% margin
- Sliced pan, 800g−4% margin
You will not see these until end of month, if ever.