Does that mean we can stop keeping mouth wash and deodorant behind lock and key on store shelves and resume locking up the criminals making messes of our cities?
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In short, no, they won't stop locking it up. They wouldn't even if there was a decline in petty crime... those locks are so that they can staff the store with 2 people instead of 5.
More staff won't solve theft significantly because thieves carry the target merchandise to a less securely monitored area of the store. If they see an employee in an aisle, they'll move down another aisle where there isn't. And you can't have a person everywhere.
If anything, putting something behind glass increases staff because we have to keep that area covered as much as possible so we get those sales.