One day last month I found myself staring at a cash register screen at a Walgreens checkout counter, carefully auditing the prices of items as they rang up to ensure that I got the advertised deep discount on pistachios. I was about to complain when the register applied the discount only after all items had been totaled. I didn't give this experience a second thought - at least not until the next day, when news broke that the FBI was investigating allegations that Pilot Flying J had over several years withheld millions of dollars in monthly diesel fuel rebates that customers had been promised. It occurred to me that those customers apparently failed to pay as much attention to transactions of thousands of dollars as I had in ensuring that I had saved $3 on a bag of pistachios.
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