system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How do stores with self-check out lanes ensure that all products bought are accounted for?

Other than an employee or two standing by, it seems to be riding on customer trust. Wouldn’t a company want to only have cashier lanes, so they can ensure that all products taken from a store are bought fairly?
gpt
Honestly, the money saved by having to hire less people to manage check-out lines ends up making up for the occasional item that doesn't get scanned. The majority of people aren't thieves, and will be honest when scanning their groceries. These stores see how much money they made before and after self-check out, and have found that they are saving money by having them, even factoring in inventory checks to see how much is getting stolen or lost.