In rural Manitoba 60 plus year ago at the local grocery store you went in, handed your grocery list to the owner and she picked the items off the shelve, added up the amounts, usually on a paper bag, bagged the items, you paid cash and left.
Then came self serve, you wheeled the cart full of items to a conveyor belt and someone read the price tags, entered them on a cash register, bagged the groceries, you paid cash and left. Sometimes it took a while if you happened to get a can without a price tag or there was a sale item the cashier forgot.
Then the devil took over the grocer stores. BAR CODES. Hell hath arrived. At first it was just a funny symbol on a can or box and the cashier continued to read paper labels but eventually the bar code took over. No lackey to cachika cachika cachika a little price marker to put cans on the shelf. No typing in every price manually. Yup, sometimes the shelf price disagreed with the bar code entry but what do you expect. It was just a stupid computer and everyone knows how temperamental they are.
Now the swing is to self check out. It's called evolution.
The cashier's paycheck doesn't come out of the store owner's pocket. It comes out of the shopper's pocket as did the shelf stocker, label placer etc.
Eventually every third shopper will be issued fluffy slippers so they can eliminate the floor cleaner.
My wife is an absolute Luddite and has used self check out for years. I'm following in her footsteps.