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And the US economy is more of a service economy, so if we do not get the service we expect there is someone else willing to provide the service we expect.
It is a service economy and what the LDS did WAS provide a service. The employee spent time making sure all of the items fit correctly and were what the customer wanted. Some of those fittings the customer may not have even been able to do correctly on his own, like the mask. It basically boils down to,
"Thank you very much for paying to keep this wonderfully stocked store open so that I can use it to find what I want and what size I need, then stiff you and buy from someone else. I also appreciate the hour of your employees time for which you will also not be seeing any reimbursement. When you fail to make ends meet and finally close your doors I will act shocked and ask how it could possibly be because there were always dozens of people in there trying stuff on."