Time is money: The driving force behind an initiative by Wal-Mart (WMT +0.5%) to test using iPhones as a self-checkout device is financial. Every extra second of transaction time at the Wal-Mart stores, adds about $12M in cashier wages. If smartphones could eventually clip 5 seconds from the average transaction checkout, the company just found about $60M behind the sofa cushions.
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