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The cashier doesn't add any value to your transaction -- he is just there is ensure the store gets your money.

I am willing to pay the sticker price for the groceries I pull off the shelf, not the cashier's skill in ringing them up.

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I, and I think most people, factor the time it takes to check out into the price I'm willing to pay for goods. This is supported by the fact that grocery store managers will often stop whatever they are doing to open new checkout lines whenever they are getting full.

And yet I know people who refused to shop at WinCo because they didn't want to bag their own groceries despite it being significantly cheaper. So there is some value in the cashier/bagger.

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