Years and years ago, I managed a small local hardware store. Theft was a big issue. You wouldn’t think it but this was when qualified help was hard to find. The place had to close...low sales in the face of home centers and box stores. But shrinkage was a real problem. I swore to never work retail again.
Our local Ace store moved to a larger building. They put a lot of distance from the registers to the front door and there are now at least 4 employees that stand in that area all the time eyeballing everyone.