Retailers are pulling back from self-checkout after years of theft, errors, and questionable time savings
(www.techspot.com)
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McDonald's kiosk? Wouldn't you like hash browns with your order?
Would you like to round up for the Boys and Girls club?
What upsell is the grocery store cashier doing? Stamps and ice?
To suggest a machine is incapable of up selling even more obtrusively than a cashier is dishonest.