There is only 1 job according to the BLS to have been completely replaced by automation . That is elevator attendant ; literally the job of pulling a level or pushing a button in an elevator . If you look back at census data from like to 1800s you will find plenty of jobs that don’t exist today. That being said nobody grew up wanting to be a software engineer in 1850. The problem is the jobs that automation tends to replace tend to be repetitive with very little critical thought needed to do the job , and the jobs that take its place require a new skillset.
If you are a 55 year old factory worker who has been bolting in the same 4 bolts for 35 years , you probably wont be able to re-skill to do something different before you retire. You also need less people . A Factory in the US needs far fewer people today to run than back 50 years ago. A factory may have supplied jobs to 5 towns full of people before, suddenly they only need 30% as many people.
In the developing world automation is also feared. Fully mechanizing farming in India is banned , because if they fully mechanized all farms there would be 20% unemployment . So many people are employed doing less efficient work because the alternative would cause many people to not have a job.
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