Today a store that used to have 5 cashiers needs 1 to monitor 5 self checkout stations.

Amazon and others are working on eliminating that final job...

They are also working on ways to fill the shelves with no human involvement, and robot shopping assistance that you can ask for help

we are probably less than 10 years away from the first retail store with no human employees, or at most 1 or 2 to monitor the robots