"FILE - In this Sept. 19, 2013 file photo, a Wal-mart representative demonstrates the now-discontinued Scan & Go mobile application on a smartphone at a Wal-mart store in San Jose, Calif. Instead of looking at the app as a failure, Wal-Mart took what it learned from ""Scan & Go"" to create another service: It found that customers like being able to track their spending, an insight that became the impetus for a program that enables shoppers to see their buying habits by storing electronic receipts. (AP Photo/Jeff Chiu, File)"
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