Retailers are pulling back from self-checkout after years of theft, errors, and questionable time savings
(www.techspot.com)
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But I am more effecient than the cashier. Dunno how it is like where you're from, but a cashier job is either for people who are nearly retired, or a teenager's first job.
So, in the same footprint of three cashiers that will have 3 queues waiting around, there can be 12 self checkouts with no queues at all.