Many years later the self-checkout machines at Home Depot still have employees supervising them so not everyone is replaced. There are also still regular check

Many years later the self-checkout machines at Home Depot still have employees supervising them so not everyone is replaced. There are also still regular checkout lines. Possibly without automation the post office would lose business to FedEx. Maybe lower costs would increase business and add more jobs somewhere else in the pipeline. This isn't a zero sum game.