Earlier quoted context omitted.
Not all machines lead to increase in the standard of living, and many things that would improve the standard of living are not done. At some point the argument you have made becomes irrelevant and cliched.
> Not all machines lead to increase in the standard of living I did not say "all" machines. If I had meant "all" I would have written "all". That's what the word "all" is for. Consider: "people like ice cream" Riposte: "not everybody likes ice cream" I see this kind of response over and over here. It's cliched and irrelevant.
In any case, since it bothers you so, you explained the situation yourself: "The self-checkout is there because it is cheaper than a cashier."
It's an error to equate "cheaper" to "increase in standard of living" because the people benefiting from the reduction in cost are usually not the entirety of the community, and it's unfortunate that someone of your caliber accepts such lazy thinking.
Over the last twenty years, automation has increased but the standard of living has gotten worse.